Two United States Marine aircraft crashed off the coast of Japan on Wednesday.
Reports on Twitter indicate that two USA military aircraft have crashed during a midair refueling operation off Iwakuni, Japan.
The planes involved are a KC-130 and an F/A 18, carrying a total of seven personnel, U.S. media quoted officials as saying.
The crew member was being assessed by doctors, the Marine statement said, adding that "the search and rescue operations continue for the remaining six".
The Maritime Self-Defense Force, which dispatched aircraft and vessels to join the rescue operation, said Japanese rescuers found one of the crew members in stable condition.
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Further details about the incident were not immediately released.
The circumstances of the mishap are now under investigation, the military added.
There were five personnel on board the KC-130 and two on board the F/A-18 at the time of the incident, a Marine official told ABC News.
The US planes had taken off from Marine Corps Air Station Iwakuni and "were conducting regularly scheduled training when the mishap occurred".
UPDATE: This story was updated at 5:45 P.M. on December 5 after one of the missing Marines was found alive.