Police in Langley, B.C., say they had to use pepper spray and a Taser as they dealt with an "unruly" crowd of young people at an illegal street racing event in the city Friday night. Langley ...
Toshihiro Kawaguchi at Kansai University said a “crowd avalanche” typically occurs after an overcrowded area reaches a density of 10 or more people per 1 square meter. At that threshold ...