Thirty-two students were evaluated for possible bee stings Thursday morning at a Gaithersburg, Md., high school, officials said.
The incident unfolded just after 8 a.m. at Quince Orchard High School. Exactly where the bees came from was not immediately clear.
Montgomery County Fire spokesman Pete Piringer said crews were "searching for the potential source of the swarm" of bees but believed they came from off the school's campus.
While dozens of students were evaluated by fire and rescue personnel, officials said only three were transported to a hospital with injuries that were not considered life-threatening. There were reports that some students may have had allergic reactions to the bees, fire officials said.