A 27-year-old police officer was arrested Sunday on suspicion of possessing stimulant drugs, police said.

Takashi Sekihara, a police sergeant at Mitaka Police Station in western Tokyo, was accused of having been in possession of 0.29 gram of amphetamines at 1:40 a.m. on Sept. 4 while with his 25-year-old girlfriend at a hotel in Hoya, western Tokyo, police said.

Sekihara reportedly admitted to the charges, telling police he used the drug after his girlfriend told him to do so. Investigators said they would pursue suspicions of stimulant use.

Sources close to the case said the two came to know each other through a telephone dating club in July last year and had been meeting at least once a month.

The woman was arrested at Ikebukuro Police Station Wednesday for selling roughly 0.5 gram of amphetamines to a male acquaintance. She told investigators that she had used drugs with Sekihara at the hotel.

Investigators said they had Sekihara appear for voluntary questioning Sunday morning and apprehended him after he admitted to the allegations.

Sekihara joined the Metropolitan Police Department in April 1991 and was promoted to sergeant in 1997.