This 2006 incident was reported yesterday in the Hair Balls blog of the Houston Press (highlighted with my emphasis):

[A] blue van drove up and three men jumped out rushing toward [12-year-old Dymond Milburn]. One of them grabbed her saying, "You're a prostitute. You're coming with me."

Dymond grabbed onto a tree and started screaming, "Daddy, Daddy, Daddy." One of the men covered her mouth. Two of the men beat her about the face and throat.

As it turned out, the three men were plain-clothed Galveston police officers who had been called to the area regarding three white prostitutes soliciting a white man and a black drug dealer.

All this is according to a lawsuit filed in Galveston federal court by Milburn against the officers. The lawsuit alleges that the officers thought Dymond, an African-American, was a hooker due to the "tight shorts" she was wearing, despite not fitting the racial description of any of the female suspects. The police went to the wrong house, two blocks away from the area of the reported illegal activity, Milburn's attorney, Anthony Griffin, tells Hair Balls.

After the incident, Dymond was hospitalized and suffered black eyes as well as throat and ear drum injuries.

Three weeks later, according to the lawsuit, police went to Dymond's school, where she was an honor student, and arrested her for assaulting a public servant.