A search and rescue operation is under way in Japan after an incident involving two US Marine Corps aircraft, BBC reports.
The planes involved are a KC-130 and an F/A-18 based at Iwakuni near Hiroshima and were carrying seven personnel, Marines officials said.
One survivor has been rescued by Japanese search teams but the six others remain missing.
US media say the two planes crashed during mid-air refuelling but this has not been officially confirmed.
The Marine Corps tweeted that the incident occurred at about 02:00 on Thursday (17:00 GMT Wednesday).
There were five personnel on the C-130 and two on the F-18.