Japan's Air Self-Defense Force says an F35A fighter jet disappeared from radar over the sea off Aomori Prefecture, northern Japan, at around 7:30 p.m. Tuesday, Japan Time.
ASDF officials said the aircraft took off from Misawa air base at around 7:00 p.m., and disappeared at a point about 135 kilometers east of Misawa City.
The officials said Maritime Self-Defense Force aircraft and vessels have begun a search mission.
They said the missing F35A was supposed to carry out a training mission with three other jets of the same type.
The Coast Guard says it will dispatch two patrol ships to look for the jet.