Another category — "flash mob" thefts or smash-and-grabs — can prove especially tricky to stop. The thieves strike in such large numbers that an individual store employee or security guard may ...

'Flash robs' take social-media driven 'flash mobs' into new and dark territory, using Twitter and Facebook to organize thefts. It's a sign of how the Internet can reshape criminal behavior.

Flash mobs are surprise gatherings of people who briefly perform an unusual act, and then disperse. But a Facebook plan for people to sing Christmas carols inside the Washington, D.C., Metro ...

The "flash mob" was the fourth in Manhattan in the past several weeks, and was organized through e-mail and the Internet. The objective is to have a large mass of people converge on a location for ...

Aug. 27, 2011 -- When a massive flash mob rampaged outside the Wisconsin State Fair injuring 11 fairgoers on Aug. 4, old-fashioned police work quickly led to the arrests of 31 people.