Police were called to the 2400 block of West 25th Street when a woman called shortly after 4 a.m. and reported someone pounding on her door, a police report said.
The first officer arriving at the apartment noticed the door open and heard a woman screaming, police spokesman Sgt. Mark Warren said. The officer found a man on top of the woman when he entered the apartment to check.
The suspect struck the officer once in the face when he was pulled off and arrested, Warren said. The officer declined medical treatment.
The suspect, a 26-year-old Lawrence man, was being held in the Douglas County Jail on suspicion of battery and battery on a law enforcement officer. Formal charges were pending and no bond had been set.
The suspect and the 25-year-old woman are acquainted but had no relationship, Warren said.