MISAWA, Japan — The cause of a fatal vehicle accident here Sunday involving a 19-year-old Misawa Air Base servicemember remains under investigation, Misawa police said Tuesday.

“We could not answer any questions concerning details of the investigation, including which side was at fault,” said a police spokesman.

The crash occurred at an intersection near the Universe supermarket at about 7:23 p.m.

Atsuko Niiyama, 66, of Rokunohe in Aomori, was turning right when an oncoming car driven by the airman struck her van. She died later of massive head injuries.

The Misawa police spokesman said the signal at the intersection was green for both drivers.

The airman, who was not injured, is a member of the 35th Aircraft Maintenance Squadron. His name has not been released.

Misawa base officials offered no more details Tuesday, including the airman’s status or location. They are cooperating with Japanese police in the investigation, according to a base news release issued Monday.

Bomb threat still probed

Japanese police and embassy officials said Tuesday they have not determined whether an Internet bomb threat against the U.S. Embassy in Tokyo is credible.

“The embassy is gathering further information on it,” said an Akasaka Police Station spokesman. “We understand that it is yet to determine whether the threat was made in Japan or outside Japan. We are waiting for specific information before starting our investigation.”

Japanese police would not have jurisdiction in the case were the threat made from outside Japan. Embassy officials said Tuesday they had no further information about the source.

Through an e-mail notice sent Monday, the embassy told Americans living in Japan that it had received a threat over the Internet about a possible bomb attack this week.

Officials would not disclose any more details about the threat.

“We were notified of the threat by U.S. Embassy on Sunday,” said the Akasaka police spokesman.

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