TOKYO — Two Japanese navy helicopters carrying eight crew members crashed in the Pacific Ocean south of Tokyo during nighttime training in a possible collision, leaving one dead while rescuers on Sunday searched for seven others missing, the defense minister said. The two SH-60K choppers from the Maritime Self-Defense Force were carrying four crew each and lost contact late Saturday near Torishima island, about 600 kilometers (370 miles) south of Tokyo, Defense Minister Minoru Kihara told reporters. [time-brightcove not-tgx=”true”] The cause of the crash was not immediately known, but officials believe the two helicopters “highly likely” collided before crashing into the water, Kihara said. The navy chief of staff, Adm.