School officials said a fire extinguisher in the 7th grade hall fell from the wall and ruptured Thursday morning.
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It filled the air with the firefighting agent from the extinguisher.
During the school evacuation, one student fell on the stairs and hurt their leg, according to officials.
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Some students were also being treated for difficulty breathing.
Buses were brought in to bring the students home.
Crews also washed the fire extinguishing chemicals from the walls and floor.