HAZELWOOD, MO (KTVI) - There was a scare at Hazelwood East when a Hazmat situation forced students out of the building.
Around 10:40 Wednesday morning, a school official smelled what he thought was chlorine.
It turned out to be muriatic acid, which is used to balance out chlorine levels in the school's indoor swimming pool.
A container of the substance was leaking.
Two students and a construction worker went to a nearby hospital, but are expected to be okay.
Summer school students were evacuated from the building and eventually bussed home.