Officials said a swarm of bees in Encino on Monday afternoon sent two people to the hospital and issued warnings to residents to stay indoors and close doors and windows.
According to the Los Angeles Fire Department, the swarm, described as having a strength in the thousands, was reported in the 17100 block of Adlon Street, near Encino Reservoir.
A man was taken to hospital after receiving multiple stings, a department spokesman said. His condition is unknown.
A second man, described as a volunteer officer with the Los Angeles Police Department, also needed medical attention after being injured while moving from the herd, the LAFD said in a statement. Officials did not specify what type of injuries the second man suffered.
According to the fire department, a professional bee repellent is required to deal with the bee swarm.
Meanwhile, officials warned residents not to go outside. The LAPD closed Adlon Place and Adlon Road as part of the incident response.