A stampede occurs when a large group of people or herd animals begins running in a panic with no clear direction. Deaths from human stampedes are primarily caused by compressive asphyxiation from the crushing force of crowds pushing horizontally and vertically. The document then provides several safety precautions for avoiding injury during a stampede, such as studying event locations in advance, keeping minimal belongings, and prioritizing escape over retrieving dropped items. In the example, hundreds died when panic broke out among the large crowd on a bridge at a festival in India, as people were crushed or fell into the river below.