Watching a concert or a sports event alongside thousands of other people can be both exhilarating and dangerous, and researchers now have new theories about how people behave when they get too close ...

A group of scientists studying the San Fermín festival in Pamplona, Spain, believe there’s a way to predict the motions of a large crowd.

A pack of wolves took down a bison in Yellowstone National Park and attracted a crowd of people — that the rest of the bison herd then charged into. Wildlife photographer Jeff Vanuga captured a photo ...

U.S. authorities restricted helicopter flights near Reagan Washington National Airport on Friday, after a midair collision ...