PHILADELPHIA — Mayor Michael A. Nutter, telling marauding black youths “you have damaged your own race,” imposed a tougher curfew Monday in response to the latest “flash mob” — spontaneous groups of teens who attack people at random on the streets of the city’s tourist and fashionable shopping districts.

“Take those God-darn hoodies down, especially in the summer,” Mr. Nutter, the city’s second black mayor, said in an angry lecture aimed at black teens. “Pull your pants up and buy a belt ‘cause no one wants to see your underwear or the crack of your butt.”

Full story: Philadelphia mayor talks tough to black teenagers after ‘flash mobs’