TUCSON – Emergency crews have responded to a chemical exposure after a vial spilled on a Tucson Unified school bus near Dodge Road and 24th Street Friday afternoon.

According to TUSD officials, about 20 children may have been contaminated in connection to the incident. Tucson Fire Department said HAZMAT crews have been dispatched to the area. TFD initially reported that the bus may be exposed to mercury.

After further investigation, first-responders the material was actually galium, a non-toxic material that may be used in science experiments. This metal supposedly is solid at normal room temperature but reportedly becomes liquid when heated slightly.

BREAKING: We are near 24th and Dodge, after reports of a mercury spill on a school bus. Emergency crews are on scene. We’ll have more information soon on @KVOA. pic.twitter.com/CZzW1aVHEL — Stephanie Weaver (@StephWeaverTV) September 13, 2019

No injuries have been reported at this time.

TUSD said the families of the students involved have been contacted. The students have been cleared to return home.

Stay with News 4 Tucson for the latest details.