[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/05/25/art.bodark0525.gi.jpg caption=" President Obama returned from Camp David on Sunday night."]
(CNN) - Three small, slow-moving aircraft entered the edge of the temporarily restricted airspace around Camp David in Maryland on Sunday as the Obama family vacationed there, a military official told CNN.
Each plane was intercepted by an F-15 fighter jet, said James Graybill, a spokesman for the North American Aerospace Defense Command. Pilots who violate restricted airspace are routinely interviewed by federal officials to determine whether further action is warranted.
The pilots "just nicked" the temporarily restricted airspace, said FAA spokeswoman Laura Brown. The incursions occurred at about 9:30 a.m., 1 p.m. and 3 p.m.
Only the last aircraft was precisely identified - it was a Beechcraft Bonanza, said Brown.
President Barack Obama planned to return to the White House later Sunday. It was not immediately clear whether the first lady and their daughters planned to return, or continue the rest of the holiday weekend at Camp David.