Japan investigates delay in reporting US Navy ship collision

Damaged part of USS Fitzgerald is seen at the U.S. Naval base in Yokosuka, southwest of Tokyo Sunday, June 18, 2017. Navy divers found

Damaged part of USS Fitzgerald is seen at the U.S. Naval base in Yokosuka, southwest of Tokyo Sunday, June 18, 2017. Navy divers found

U.S. military personnel work on board the damaged USS Fitzgerald at the U.S. Naval base in Yokosuka, southwest of Tokyo Sunday, June 18

Damaged USS Fitzgerald is seen at Yokosuka Naval Base, south of Tokyo, Sunday, June 18, 2017. Navy divers found the bodies of missing

Vice Adm. Joseph Aucoin, Commander of the U.S. 7th Fleet, speaks during a press conference with the damaged USS Fitzgerald as backgroun

Damaged USS Fitzgerald is seen at Yokosuka Naval Base, south of Tokyo, Sunday, June 18, 2017. Navy divers found the bodies of missing

Damaged USS Fitzgerald is seen at Yokosuka Naval Base, south of Tokyo, Sunday, June 18, 2017. Navy divers found the bodies of missing

Damaged USS Fitzgerald is seen at Yokosuka Naval Base, south of Tokyo, Sunday, June 18, 2017. Navy divers found the bodies of missing

In this Saturday, Junes 17, 2017, photo, the damaged USS Fitzgerald is seen off Yokosuka, near Tokyo, Japan, after the Navy destroyer c

In this Saturday, June 17, 2017, photo, the container ship ACX Crystal goes through the Tokyo Bay after colliding with the USS Fitzgera

In this Saturday, June 17, 2017, photo, the container ship ACX Crystal with its left bow dented and scraped after colliding with the US

In this Saturday, June 17, 2017, photo, the container ship ACX Crystal with its left bow dented and scraped after colliding with the US

TOKYO (AP) — Japan's coast guard is investigating why it took nearly an hour for a deadly collision between a U.S. Navy destroyer and a container ship to be reported.

A coast guard official said Monday they are trying to find out what the crew of the Philippine-flagged ACX Crystal was doing before reporting the collision to authorities 50 minutes later.

The coast guard initially said the collision occurred at 2:20 a.m., as the Philippine ship had reported it at 2:25 a.m. and said it just happened. After interviewing Filipino crewmembers, the coast guard has changed the collision time to 1:30 a.m.

The ACX Crystal collided with the USS Fitzgerald off Japan's coast early Saturday morning, killing seven of the destroyer's crew of nearly 300.