A swarm of nearly 40,000 bees attacked police responding to a single bee sting report.

A group of firefighters and police that were responding to a bee sting were attacked Thursday afternoon by a swarm of nearly 40,000 Africanized bees.

Pasadena Fire Department spokeswoman Lisa Derderian tells TIME that the department was the first to arrive to treat a civilian, unaware of the size of the swarm. The first firefighter on the scene received up to 15 to 20 bee stings. Derderian said the bright yellow on their uniforms “didn’t help” because bees are attracted to the bright color; the bees then attacked the firefighter’s face and hands. Once the fire department understood the situation, backup began arriving in bee protective clothing.

Africanized bees, commonly referred to as killer bees, are a hybrid that was first introduced in 1956, in Brazil

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