A Madison man is accused of sexually assaulting a 19-year-old Madison woman Saturday afternoon at a house party, according to a news release from Madison police.

Police said others at the party in the 1500 block of Jefferson Street intervened and reported the attack to police.

The woman was drunk when she as attacked, according to the news release.

Zachary M. Vannatta, 22, was found at his home and arrested on suspicion of second-degree sexual assault.