Story highlights The sailor is found on a station platform

Police are investigating the death as either an accident or a crime

It comes after the U.S. military imposed a curfew on troops in Japan

A U.S. Navy sailor has been found dead with a head injury at a Japanese train station, local police said Monday.

Petty Officer 2nd Class Samuel Lewis Stiles was discovered surrounded by seven or eight alcoholic drink cans on the platform in Haiki Station in Nagasaki Prefecture at 5 a.m. Sunday, Haiki police said.

The death, which police say they are investigating as either an accident or a crime, comes at a delicate time for the U.S. military in Japan after two U.S. sailors were arrested earlier this month on accusations they raped a local woman

That case provoked an angry reaction from Japanese officials, and the U.S. military responded by imposing a curfew on its troops in Japan . The curfew restricted military personnel to bases, personal homes or hotels between 11 p.m. and 5 a.m.

The time at which Stiles's body was found suggests he may have been out in breach of this curfew.

He was wearing civilian clothes, not uniform, and didn't have any personal belonging around him, police said. Stiles was stationed at the U.S. base in Sasebo, the city in Nagasaki where Haiki Station is situated.