York Regional Police have charged a Toronto man with a number of crimes, including human trafficking.

The investigation started in late December with the investigation of a sexual assault allegation involving a 28-year-old woman, they said Wednesday in a news release.

"Through investigation, it was discovered that on several dates in December 2009, the victim was forced to perform sexual acts with various men and was forced to assist a man who was (allegedly) committing various criminal offences."

Last Friday, members of the York police drugs and vice unit made an arrest.

Mark Stewart, 49, faces a number of charges, including:

• trafficking in persons
• three counts of sexual assault
• two counts of procuring
• assault
• resisting arrest

He also faces some property crime and drug-related offences. Stewart has been released from custody and is to appear in court on March 17 in Newmarket.