Mahon’s twin brother, Daniel, was acquitted of the only charge he faced in the case.

During the six-week trial, prosecutors argued the Mahon brothers bombed Logan on behalf of a group called the White Aryan Resistance, which they said encourages members to act as “lone wolves” and commit violence against non-whites and the government.

Prosecutors showed surveillance tapes of the brothers referring to Logan in racial slurs. They also played a voicemail that Dennis Mahon left at Scottsdale’s diversity office just months before the bombing in which he angrily said: “The white Aryan resistance is growing in Scottsdale. There’s a few white people who are standing up.”

Defense attorneys said Logan’s job made him unpopular and someone working for the city of Scottsdale was likely the perpetrator.

They also heavily criticized the use of 41-year-old Rebecca Williams as an informant, giving her the nickname “trailer park Mata Hari” — a reference to the Dutch exotic dancer who was convicted of working as a spy for Germany during World War I.

Investigators met the former stripper through her brother, an informant himself on the Hells Angels motorcycle gang, and recruited her for the Mahon case, directing her to act like a government separatist and racist. She wore revealing clothes and sent racy photos to the brothers to win their trust.

Williams met the brothers in January 2005 after investigators set her up in a government-provided trailer at a Catoosa, Okla., campground where the brothers were staying at the time. A Confederate flag was placed in her window, and prosecutors say the Mahons introduced themselves within minutes of her arrival.

Dennis Mahon opened up to Williams as their conversations were recorded, telling her how to make bombs after she told him a fictitious story that she wanted to harm a child molester she knew.

In one conversation, she asked Mahon if he ever had a bomb work, to which he replied: “Yeah, diversity officer.”

Logan testified at trial about the unbearable pain he felt after he opened the package, describing the lights going out, the room filling with smoke and debris falling from the ceiling.

Logan, who now works as a diversity administrator in the Phoenix suburb of Glendale, was hospitalized for three days. He needed four surgeries to remove shrapnel from his arm and hand, do a skin graft on his severely damaged forearm and restore some use to one of his fingers that nearly had to be amputated.

Even after Dennis Mahon was convicted, his lawyers say he maintains his innocence.

They also say no evidence shows the bombing was done with the intent to seriously injure or kill Logan. They argued the facts fell far short of a 100-year sentence, noting there were no deaths or life-threatening injuries from the bombing.

Prosecutors, who recommended a sentence of more than 60 years, say Dennis Mahon intended to send a political message in trying to kill Logan.

The Mahons were living in the Phoenix area at the time of the bombing but left days afterward and were arrested in 2009 in Illinois.

Dennis Mahon’s attorneys argued their client “often makes exaggerated self-aggrandizing claims” that aren’t true, that he was an alcoholic who constantly was drinking Everclear, and that his statements to Williams were meant to impress her.

Dennis Mahon was found guilty of conspiracy to damage buildings and property by means of explosives; malicious damage of a building by means of explosives; and distribution of information related to explosives

Daniel Mahon was acquitted of conspiracy to damage buildings and property.

Tasya Peterson, a spokeswoman for the Arizona Department of Economic Security, which oversees the state’s child welfare agency, declined to confirm the visit or say why the girl’s father, Sergio Celis, isn’t allowed to be with his two boys.

Authorities have been searching for Isabel since her father reported her missing April 21. Family members have said they last saw her in her bedroom the night before. A window was later found open with the screen pushed aside.

A few days after the disappearance, a neighbor told KVOA-TV that she heard her dogs barking and male voices outside her bedroom window around 6:30 a.m. on the day Isabel was reported missing. The neighbor said there were no sounds that indicated a struggle. Police have declined to comment on those details.

Earlier this week, police released 911 recordings of Sergio Celis reporting his daughter missing. He was calm while Isabel’s mother, Rebecca Celis, was full of emotion.

Calls to Sergio and Rebecca Celis weren’t returned Thursday afternoon.

No one answered the door at the Celis house when The Associated Press rang the bell Thursday. A sign hung on an exterior wall that said, “Bring ‘Isa’ home.” Fliers with the 6-year-old’s photo were posted outside several homes along the block consisting of modest red-brick and stucco homes.

Police have scoured the family’s home, interviewed more than 500 sex offenders and waded through 1,000-plus tips. They looked for the girl in a 3-square-mile area around her home, ponds, dry streambeds and empty houses. They also searched her house, but a judge has sealed those records until at least later this month.

Hawke said police haven’t determined whether Isabel was abducted by a stranger or someone the family knew. She also said there’s no way at this point in the investigation to conclude whether the girl is still alive.

“There are numerous cases that have happened over the years where somebody may go missing for days, months, even years before they are located,” Hawke said. “So we do have that same hope in this case that she will be found alive.”

Hawke said police are still aggressively pursuing the investigation and are nowhere near declaring this a cold case, adding it would likely be several weeks before police reach that point.

David Pike, who lives six doors down from the Celis family, recalls seeing Sergio Celis from time to time walking his daughter through the neighborhood. “She just wasn’t allowed to just waltz off. Mom and dad kept a sharp eye on her,” Pike said.

Pike’s wife, Linda Pike, said the girl’s disappearance has been hard on people in the neighborhood. “I think most people in this neighborhood that we talk to have a hope that she is still alive,” she said.

Bob Lowery, executive director of the missing children division of the National Center For Missing & Exploited Children, said the chances of finding a missing child decrease the longer he or she is missing because police have already investigated leads and run out of places to search. “Time is the enemy when we are looking for missing children,” Lowery said.

But Lowery said there have been notable cases of missing children being found long after they were reported missing, citing the disappearances of Elizabeth Smart and Jaycee Dugard.

Smart was kidnapped in 2002 in Utah. Motorists spotted her as she walked with her captors nine months after a handyman who knew her family took her at knifepoint.

Dugard was snatched off her family’s South Lake Tahoe street in June 1991 while walking to a school bus stop and was held captive in a backyard compound for 18 years. She was discovered in August 2009 when authorities said her captor took her and her children to a meeting with his parole officer.

“We never stop looking for children until we 100 percent know what’s happened,” Lowery said.

Authorities have been searching for the girl since her father reported her missing April 21. Family members have said they last saw her in her bedroom the night before. A window was later found open with the screen pushed aside.

A few days after the disappearance, a neighbor told KVOA-TV that she heard her dogs barking and male voices outside her bedroom window around 6:30 a.m. on the day she was reported missing. The neighbor said there were no sounds that indicated a struggle.

Police declined to comment on her account.

Authorities searched for Isabel in a three-square-mile area around her home, ponds, dry streambeds and empty houses. They also searched her house, but a judge has sealed those records until at least later this month.

Police had examined the possibility that Isabel was in Mexico because of Tucson’s close proximity to the border. Federal authorities have been in touch with Mexican police officials who checked hotels, bus terminals and other businesses as they looked for her.

Meanwhile, Sergio Celis, an opera singer, sang “Ave Maria” at a May 6 benefit to raise money for the search for his daughter.

Police announced in a news release late last week that Arizona’s child welfare agency was barring him from having any contact with his 10- and 14-year-old sons. On Monday, after a regularly scheduled news conference, investigators released 911 recordings of him reporting his daughter missing.

He was calm while her mother’s reaction was full of emotion.

Sergio Celis told a 911 operator that he believed his daughter was abducted. Asked to explain why he thought that, Celis said, he couldn’t and that Isabel wasn’t there when the family awoke.

“I want to report a missing person,” he said, calmly. “My little girl, who is 6 years old. I believe she was abducted from the house.”

The tone of Celis’ wife, Rebecca, was frantic. “She’s only 6,” said the mother as she cried. “Can you please hurry and get somebody over here?”

Calls to Sergio and Rebecca Celis weren’t returned Tuesday.

Michael Piccarreta, a criminal defense lawyer in Tucson who isn’t involved in the case but has followed it, said family members are normally eliminated as possible subjects at this point in investigations. In some cases, he said, police focus on family members longer than usual.

“That doesn’t mean they are guilty,” Piccarreta said. “It could mean the police are having difficulty with an alternative theory.”

Police spokeswoman Maria Hawke said investigators have eliminated one theory. “She didn’t get up and leave the house on her own,” Hawke said. She declined to discuss the evidence that led investigators to make that conclusion or reveal details about who they suspect took her.

Experts say the abduction of a child from a home is relatively rare.

Police are holding out hope that Isabel is still alive.

Tasya Peterson, a spokeswoman for the Arizona Department of Economic Security, which oversees the state’s child welfare agency, declined to comment on why Sergio Celis isn’t allowed to be with his two boys. She also declined to say whether there were any past calls at their home.

The Arizona Daily Star had reported early Tuesday that police concluded that Isabel was abducted.

Lynn Jones, a criminology professor at Northern Arizona University, said the public will connect the decision to prohibit Celis from seeing his sons with the 911 recordings because they were both released around the same time.

“So law enforcement, I would imagine, would have to do some work if they don’t want them to be perceived together,” Jones said.

Hawke said it was a coincidence that the two pieces of information were released at once and that the child welfare decision was released to keep the public informed of the investigation. News organizations had been requesting the 911 recordings, which take a while to prepare and happened to be ready on the same day as the child welfare news conference.

“People are free to form their own opinions,” Hawke said.

David Pike, who lives on the same block as the Celis family and whose sons used to play with Isabel’s brothers, said he is perplexed by how calm the father sounded in the 911 phone calls.

“It just struck me as odd. I get excited easily if I think one of my kids are hurt … and then there’s times I’ve just sat there dumbfounded. Maybe that was a dumbfounding moment for him and he wasn’t able to wrap his mind around it right away,” he said.

“Maybe he truly thought she was playing a game,” Pike said.

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Associated Press reporter Terry Tang contributed from Phoenix.

If the court upholds those parts of Arizona’s law, the ruling would codify that type of local enforcement and open the door to such tactics in states with similar laws, such as Alabama, Georgia, Indiana, South Carolina and Utah.

“I think you’ll see more involvement by local police in immigration enforcement, an involvement that hadn’t previously been seen,” said Kevin Johnson, law school dean at the University of California-Davis and an immigration law expert.

A federal judge put parts of the Arizona law on hold shortly before they were to take effect in July 2010. Other states followed with similar legislation and — combined with other state immigration laws and an ailing economy — played a part in tens of thousands of illegal immigrants moving elsewhere.

“If you want to turn around this invasion, then (you should) do attrition through enforcement,” said former state Sen. Russell Pearce, architect of the 2010 law and the driving force behind other Arizona immigration laws.

Arizona has argued it pays a disproportionate price for illegal immigration because of its 370-mile border with Mexico and its role as the busiest illegal entry point into the country.

The Obama administration said the law conflicts with a more nuanced federal immigration policy that seeks to balance national security, law enforcement, foreign policy, human rights and the rights of law-abiding citizens and immigrants.

During arguments over the law, liberal and conservative justices reacted skeptically to the administration’s argument that the state exceeded its authority when it made the records check, and another provision allowing suspected illegal immigrants to be arrested without a warrant.

Civil rights groups say Arizona’s and the other states’ measures encourage racial profiling and ethnic stereotyping.

Immigrant rights advocates, who believed the courts would reject attempts by states to grab more law enforcement power, were not expecting the justices’ response. They said a Supreme Court validation of the law would frighten immigrants further and cause Latinos who are in the country legally to be asked about their status.

“The crisis here in Arizona would only multiply,” said Carlos Garcia, organizer of an immigration march that drew several hundred people in downtown Phoenix on Wednesday. Authorities said at least nine people were arrested for blocking a street and refusing to move.

“It would mean that anyone, as they are leaving their home — whether they are going to work, to church, wherever they are going — could be asked for their documents,” he said.

The court’s comments surprised state officials and had, thus far, lost all major court battles over the law.

Arizona Attorney General Tom Horne, whose office has helped defend the law, predicted the court will uphold the law because many of its provisions mirror existing federal laws. He said a year from now the state will see even less illegal immigration.

“You won’t see anything that noticeable as far as law enforcement goes,” Horne said. “But you will see less people sneaking across the border.”

It was unclear what the court would do with other aspects of the law that have been put on hold by lower federal courts. The other blocked provisions make it a state crime for immigrants not to have immigration registration papers and for illegal immigrants to seek work or hold a job.

Peter Spiro, a Tempe University law professor who specializes in immigration law, predicted the court would uphold the police check of immigration status in Arizona’s law, but said he wouldn’t be surprised if the court threw out a provision making it a crime to be without immigration documents.

Such a ruling would let police question people about their immigration status if they have good reason to do so, but police would have to call federal authorities to see if they would want to pick up anyone found to be in the country illegally. If federal agents decline, officers would have to release the person, unless they were suspected of committing crimes, Spiro said.

If that happened, the law would be mostly symbolic, but would still carry some significance for immigrants, Spiro said. “It would make it clear that Arizona is unfriendly to undocumented aliens,” Spiro said.

A decision in the case is expected in late June.

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Associated Press reporter Mark Sherman contributed from Washington, D.C.