SASEBO NAVAL BASE, Japan — A civilian crewmember from a Military Sealift Command ammunition ship that made a short port call here remained in Japanese custody Wednesday for suspicion of assault.

Randy Edward Van Dusen, 28, a USNS Kiska crewmember, was arrested for allegedly throwing a beer bottle at a 34-year-old man outside of a Minato bar Sunday, a Sasebo Police Department official said Wednesday.

Base officials referred questions to the Far East Military Sealift Command in Yokohama. An official there referred questions to Commander, Logistics Group Western Pacific in Singapore. A Navy spokesman in Singapore was unable to respond by deadline.

Around 1:10 a.m., the police official said, a man outside the bar approached Van Dusen because he “looked sick.” According to police, Van Dusen hit the man in the head with a beer bottle, causing “cut wounds which will require two weeks to heal.”

Police said the injured man asked an unidentified individual to call police. Van Dusen still was near the bar when police asked him to come in for questioning. He was arrested around 9:12 a.m.

The police official said Van Dusen admitted to hitting the man, but denied throwing a beer bottle at him.

The case was sent to the prosecutor’s office Monday, but Van Dusen had not been charged as of Wednesday, the spokesman added.

The Kiska made a port call Friday through Sunday at Sasebo. The vessel is one of six ammunition ships that are part of the 37-ship Naval Fleet Auxiliary Force, according to the MSC Web site.