On the heels of a flash mob robbery in a Germantown 7-Eleven last weekend, a group of 10 girls robbed a convenience store in Northeast, D.C. on Thursday, stealing about 70 dollars worth of merchandise. WJLA reports that it’s the third time in two weeks the mob robbed the location. On Friday, Mayor Vince Gray denounced the crimes.

“We will not tolerate such reprehensible behavior here,” Gray said in a statement.

Gray admonished residents who tried to excuse the youths involved in the recent incident at the Shop Express on Benning Road NE.

“Some news coverage of this incident has reported residents questioning whether the robbery could have been morally justified,” Gray said. “Actually, both morality and the law are quite clear: It is wrong to steal from others. And if people do not obey the law, they will be apprehended, arrested and prosecuted.”

After the Germantown robbery — and fueled by similar flash mob incidents around the country — Washington-area police announced this week that they’re preparing to combat the flash mob tactic (it’s been said that groups coordinate using Twitter and Facebook, though it appears that at least one of the recent D.C.-area incidents was organized through word of mouth).