MINNEAPOLIS (WCCO) — Authorities aren’t sure what caused the explosion that evacuated a Brooklyn Center school, and restricted traffic in the area on Tuesday afternoon.

Initial reports said a gas leak was the culprit in the basement of the Brookdale Christian Center at 6030 Xerxes Ave. North.

Brooklyn Center Fire Chief Lee Gatlin said investigators aren’t sure what caused the explosion, but he does believe it came from the direction of the building’s boiler.

No injuries have been reported, the fire department said.

The Rev. Bernard Bouissieres, the senior pastor at Brookdale Christian Center, said he’s thankful everyone was able to get out of the building safely.

“[The students] knew what to do, because our teachers teach them the drills,” Bouissieres said.

The investigation on what caused the explosion is on hold until a structural engineer can determine if the building is safe.