Cop goes after Pride marcher with baton

Video of a teen being grabbed by the neck and punched by a cop has sparked outrage in Pittsburgh--not least because she was apparently arrested while arguing with an anti-gay activist protesting the city's PrideFest.

Pittsburgh Mayor Bill Peduto says he has launched an investigation into the incident and promised that "we won't look the other way," according to WPXI.

The footage, posted to Facebook Sunday afternoon, shows the officer grabbing the girl by the hair, trying to pull her to the ground and delivering several blows to her head and body as she continued to resist.