The Maritime Safety Agency issued a report of its own investigation into the April 9 collision in which a U.S. Navy submarine did not come to the aid of a Japanese freighter it had rammed.

Two Japanese seamen died in the collision, which occurred in the East China Sea between the submarine George Washington and the freighter Nissho Maru.

The Japanese report, based on interviews with the 1 survivors, said that immediately after the collision two seamen hoisted an "NC" flag, an international distress signal and that all 15 crew members boarded life rafts before the ship sand 15 minutes later.

These points clearly contradict an interim report released earlier by the U.S. Navy, which said that the commanding officer of the submarine observed the ship through his periscope after the collision but "did not note any signs that the ship was in distress."

In another discrepancy, nine of the survivors reported sighting a plane with U.S. markings flying about the freighter during the period between the collision and the sinking. The U.S. report said the air crew engaged in exercises with the submarine was "unaware of the impending collision and the subsequent plight of Nissho Maru's crew."