Nearly an hour elapsed before a Philippine-flagged container ship reported a collision with a U.S. warship, the Japanese coastguard said on Monday, as investigations began into the accident in which seven U.S. sailors were killed. The U.S. Navy confirmed that all seven missing sailors on the USS Fitzgerald were found dead in flooded berthing compartments after the destroyer's collision with the container ship off Japan early on Saturday. The Fitzgerald and a Philippine-flagged container ship collided south of Tokyo Bay early on Saturday. The cause of the collision is not known. Multiple U.S.