People reported hearing a loud crack before a massive branch, estimated to weigh several hundred pounds, came tumbling down from an old oak tree, authorities said.

An 8-year-old boy was struck and killed by a tree branch that fell while he was attending a summer camp at King Gillette Ranch in Calabasas on Wednesday afternoon, July 9, authorities said. Authorities responded just after 2:50 p.m. to the ranch in the Santa Monica Mountains. Camp staffers were giving aid to several people.

An 8-year-old died after a tree branch fell on him while at summer camp, California officials said. On July 9, the 8-year-old and a group of other kids and adults decided to get some shade under an oak tree at the camp in Calabasas, according to a news release by the Los Angeles County Sheriff’s Department.