DETROIT, MI -- A Detroit woman who called police for protection was sexually assaulted by an officer who responded, according to the Wayne County prosecutor's office.

Detroit police officer Deon Nunlee was charged Friday with second-degree sexual assault, assault with intent to penetrate and misconduct in office.

According to the prosecutor's office, the 31-year-old victim called 911 to report an assault by her boyfriend. When Nunlee and a second officer responded, she told authorities Nunlee assaulted her in a separate room.

"Nunlee took the woman upstairs and his partner remained with the male downstairs," Wayne County Prosecutor Kym Worthy's Office said Friday. "It is alleged that when Nunlee was in an upstairs bedroom with the woman he sexually assaulted her.

"While they were alone upstairs Nunlee indicated he would be coming back to the house later at 7 a.m. When officer left the house the woman reported the crime to two friends and the next day reported it to the police."

The incident occurred about 3 a.m. on Oct. 30 at a home on the 16000 block of Asbury.

Detroit Police Department representatives said they plan to release a statement about the matter late Friday afternoon.

The Detroit police investigation into the matter began Oct. 31. The warrant request was turned over to the Wayne County Prosecutor's office on Feb. 13.

Nunlee was arraigned Friday and held on a $50,000, 10 percent surety bond.