BOGOTA, Colombia (AP) _ Authorities on Wednesday said they spotted the wreckage of a small plane flown by a U.S. pilot that disappeared a week ago in mountains in eastern Colombia.

A civil air patrol plane sighted the downed Cessna piloted by American John Mallinson in mountains in eastern Arauca state, near the border with Venezuela.

The rough terrain made it impossible for the crew to land, however rescue pilots said it appeared unlikely that Mallinson could have survived the impact. Mallinson's age and hometown were not immediately available.

The U.S. aviator was last heard from on Dec. 31 in a radio communication with air traffic controllers. The plane's wreckage was located just south of Saravena, a town about 205 miles northeast of the capital, Bogota.

Mallinson was the only occupant of the plane, which was crossing Colombian airspace on a flight path between the Dominican Republic and Bolivia when it crashed, authorities said.