NIAGARA FALLS, N.Y. (AP) — Rapper Big Sean faces charges in upstate New York after a woman complained she was sexually assaulted during a concert.

State park police charged the 23-year-old Detroit rapper with misdemeanor counts of forcible touching, unlawful imprisonment and sex abuse. Another Detroit man, Willie Hansbro, faces the same charges.

Police received the complaint Thursday night at Artpark State Park in Lewiston, just downriver from Niagara Falls. Anderson was performing there with rapper Wiz Khalifa.

Authorities won’t detail what happened.

Big Sean and Hansbro were issued appearance tickets and released on $500 bail. They’re scheduled in Niagara County Court on Sept. 6.

Big Sean’s real name is Sean Anderson. Neither his press person nor his record company has responded to requests for comment made Friday. There’s no available phone listing for Hansbro.

Copyright 2011 The Associated Press.