A sprawling NASA research center next to Cleveland's airport is under lockdown amid reports of a possible gunman.
NASA Glenn Research Center spokeswoman Sally Harrington wouldn't say whether police were checking for a gunman but she says the complex was placed under "complete lockdown" Friday morning.
The center is located at the edge of Cleveland Hopkins International Airport along the Cleveland-Brook Park border. Brook Park police withheld details on how they were handling the situation. Cleveland police say they aren't involved.
The research center is named after Ohio-born astronaut John Glenn and has more than 3,400 employees and contract workers. It recently developed key components of a new moon rocket.
An airport spokewoman says its operations are unaffected.