The countrys top police chief, Hou You-yi, vowed on Monday to capture two men who raped a female medical student around midnight Sunday near the Shilin Night Market.

When questioned by lawmakers at the Legislative Yuan, Hou, director-general of the National Policy Agency, said that authorities have collected semen samples from the victims body, but could not promise when there will be a breakthrough in the case.

According to Apple Daily, a popular tabloid newspaper, the victim is a medical student. She reportedly parked her scooter at the Jiantan Station around nine oclock on Sunday night to go shopping with her friends at the Shilin Night Market.

The report said the victim separated from her friends around midnight and walked back to the station alone in the rain to pick up her scooter. While she was getting her scooter out of the parking lot, a man jumped out of a car and dragged her into the back seat and took off her glasses, while another suspect drove the three to the riverbank under the freeway overpass, where the woman said she was raped repeatedly.

The assailants, whom the victim said were slightly plump, close to 30 years old, and spoke a mix of Taiwanese and Mandarin, also robbed the woman of her belongings. Some reports said police found the womans empty handbag at the alleged crime scene.

The woman was reportedly left half-naked next to the riverbank and was later rescued when she hailed a couple on a scooter on the nearby main street. She was immediately brought to the police, who later took her to the hospital where a rape kit was collected.

Shilin District Precinct Captain Ho Ming-chou said the men did not wear a condom during the sexual act and the medical examiner has already taken a semen sample from the victims body. The next step, said Ho, is to match the DNA samples to a database of sexual predators.

"The area around Shilin Night Market is considered to be high-risk. We will increase police surveillance around the area to make sure we apprehend the perpetrators as quickly as possible," Ho promised.

Taipei City Hau Lung-bin （郝龍斌） vowed on Monday that the police would do everything they can to solve the crime quickly and pledged to re-evaluate the citys public lighting system, especially in dark alleys.

He also promised that the victims identity would be protected.

"To ensure the well-being of the victim and her family, all social workers, police, and health personnel involved in this case will face disciplinary action if they release the victims personal information to the media," the mayor warned.

During a legislative hearing, Kuomintang lawmaker Justin Chou （周守訓） lambasted Hou for "poor leadership" and said Premier Su Tseng-chang （蘇貞昌） was merely paying lip service when he vowed to reduce the crime rate in the country within his first six months of office.

Hou fired back, arguing that violent crime had decreased by 15 percent last year. Moreover, the police have a 90 percent success rate in solving serious crimes and the figure continues to improve, he said.

To date, four of six notorious sexual predators, dubbed by the media as the "Six Wolves," are still on the loose in the greater Taipei area.