DENVER -

A Denver real estate broker has been charged with sexually assaulting three strangers - including a 13-year-old girl.
    
The Denver Post reported Wednesday (http://bit.ly/TbLfF4) that William Costello is charged with multiple counts of sexual assault, kidnapping and impersonating a police officer. One alleged assault involved a 13-year-old girl.
    
Costello was being held on $200,000 bond. It wasn't immediately known if he had an attorney.
    
Costello was arrested Nov. 5 after DNA linked him to three attacks dating back to 2008. His DNA was taken after an alleged assault on an anti-abortion protester in July.
    
A state law requires police to take DNA samples from anyone charged with a felony.