SANTA ANA, Calif. (KTLA) — Four students were hospitalized on Tuesday following a boiler room explosion at a high school in Santa Ana.
School was in session when the blast lifted the roof of the gymnasium at Valley High School just after 7:30 a.m.
Four students were sitting on a bench outside the building when the boiler room exploded.
Two boys and two girls who complained of hearing trouble were transported to an area hospital.
A total of seven students were evaluated for injuries, Capt. John Muir from Orange County Fire Authority said.
None of the injuries were determined to be serious.
“It was very fortunate that these people were not hurt, and the rest of the school was in another location,” Muir said.
The explosion was determined to be an accident caused by a mechanical malfunction or a gas leak, Muir said.
The exact cause of the blast was still under investigation.
Video showed parts of the roof had been separated from the gymnasium walls. The building was severely damaged and ruled unsafe by authorities.
Students and staff were temporarily moved to other parts of the campus while a bomb squad investigated the scene.