WASHINGTON - A two-seat plane had to be escorted to the ground by an F-15 fighter after straying into a restricted zone around Camp David in Maryland. President Barack Obama is spending most of the Fourth of July weekend with his family there.

Authorities tried to contact the plane via radio Saturday, but it did not respond. It was intercepted about 1:20 pm about six miles (10 kilometers) from Camp David and escorted to Hagerstown, Maryland, where it landed.

A spokeswoman for the North American Aerospace Defense Command, Capt. Angela Young, said the plane was flying from Salisbury, Maryland. The pilot was met by local law enforcement after landing in Hagerstown.

Secret Service spokesman Ed Donovan says the pilot was interviewed and authorities determined it was an accident.