Police consider the four people armed and dangerous.
Despite several unconfirmed sightings in the metro area last week, detectives don't know whether the suspects, all thought to be members of an Asian gang, are still in Colorado. Boulder police arrested two other suspected Asian Crips members Sept. 4. Both remain in custody. Police on Monday authorized the Boulder County Sheriff's Department to release the photo of Cheu Vang. The assailants drove the woman into the foothills, where they each raped her before leaving her on Lefthand Canyon Drive near Olde Stage Road, police said.