Police on Wednesday arrested two doctors in their 20s on suspicion they raped a woman after giving her a drug-laced alcoholic drink during a party in Tokyo in January.

The police detected traces of a sleep-inducing drug in the woman's body and suspect the men obtained it by exploiting their position as doctors.

Masataka Kaneko, a 28-year-old physician at Showa University Hospital in Tokyo, has denied the allegations, telling the police, "I had sex (with the woman) based on mutual consent." Hisaaki Obayashi, a 26-year-old trainee doctor at an affiliated hospital, denied lacing the woman's drink with any drug.

According to the police, the two men were arrested on suspicion of causing the woman, also in her 20s, to lose consciousness after spiking her drink at a karaoke bar near Meguro Station in Tokyo's Shinagawa Ward and taking her to Kaneko's home between around 11 p.m. on Jan. 18 and 5:30 a.m. the next day.

Footage from a security camera installed at Kaneko's condominium showed the two suspects carrying the woman, who was unable to walk on her own, according to the police, who handed the case to prosecutors Thursday.

The three and another woman in her 20s had been at a drinking party from around 7:30 p.m. on Jan. 18. The woman notified the police of the alleged assault shortly after it took place, according to the police.

Police are also investigating a complaint made by the other woman.