Every once in a while, crowded train stations have been known to break into song and dance and then disperse as if nothing happened. Large groups of people freeze for a period of time and then ...

Add Yahoo as a preferred source to see more of our stories on Google. Officials in Jersey Shore towns say they are not equipped to deter minors from organizing in large groups that often lead to chaos ...

*Refers to the latest 2 years of stltoday.com stories. Cancel anytime. PHILADELPHIA — The mayor of Philadelphia is combating marauding groups of teenagers and pre-teens known as "flash mobs" by ...

The phenomenon of the flash mob — masses of people organized using social media — began innocently enough and quickly mushroomed. Among the highlights in recent years: One hundred people danced to ...