Updated

Philadelphia's mayor is apologizing to a woman who was shown on video being punched by a police lieutenant at a parade last weekend.

Mayor Michael Nutter said Thursday he has seen the video about 20 times and is "appalled," "sickened" and "ashamed" by what happened. The apology comes a day after police Commissioner Charles Ramsey announced Lt. Jonathan Josey was being suspended for 30 days with the intent to dismiss.

A 36-second video on YouTube shows 39-year-old Aida Guzman being struck in the face and falling to the ground, her face bloodied, then being led away in handcuffs. Police say people had been throwing liquid at officers during a celebration at the city's annual Puerto Rican Day Parade.

Prosecutors have withdrawn a disorderly conduct charge against Guzman.