Others have been stung elsewhere in Arizona this spring.
Bee swarms are typical this time of year when communities of bees divide and part of the group moves out with one queen in search of another home. Experts say to run away from an attack, don't swat at the bees and carry injectable anti-allergy medication if you are allergic to bee stings.
Arizona State University recently sent an alert to students when a swarm of the flying insects was seen on campus. Workers secured the area with caution tape, saying the swarms typically aren't interested in harming people. But they can become aggressive if they're disturbed near their colony.