YORK, Pa. (AP) - A man who proposed to his girlfriend at a New Year's party allegedly knocked her out with a steering wheel lock just hours after she said yes, police said.

Stephen Mujerm, 40, of Lanham, Md., and new fiancee Victorine Taboh began arguing about 6 a.m. Monday as they drove home from the party in northern York County.

Taboh, of Laurel, Md., and another passenger were complaining that Mujerm was driving recklessly, police said. He then stopped the vehicle beside Interstate 83 in Springfield Township, where he and Taboh got out and began to argue.

As the confrontation escalated, Taboh began breaking the windows of Mujerm's car with a steering wheel lock, police said. Mujerm then punched Taboh and hit her in the head with the lock, knocking her unconscious, said police.

Emergency medical workers took Taboh to a hospital, where she was treated and released, police said.

State police charged Mujerm with aggravated assault, simple assault, reckless endangering and driving while under the influence of alcohol.

A phone number for him could not be located.