Details are sketchy, but something has apparently happened to interrupt President Obama's vacation in Hawaii. According to the latest pool report, the president left the golf course "sudden[ly]." The same report says the reason for Obama's departure "is not a matter of national security or because of the president's safety. It is a personal matter."
There is reportedly an ambulance near the Obamas' vacation home, and the president returned there in a "very high-speed and dramatic motorcade," the pool report says.
Update: CNN's reporting that a friend of the Obama family sustained a minor injury.
Update 2: The New York Times' Peter Baker reports that the son of a friend of Obama's, Eric Whitaker, was hurt and needed stitches. "A White House official said the president and his family were fine and not involved," Baker writes.