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CHINO, Calif. (KTLA) — A small passenger jet crashed into a hangar at the Chino Airport Thursday, sending workers running for cover.

The crash was reported just after 6 p.m., as the Bombardier Challenger jet was undergoing an engine test, with its engine revved at full speed.

“The plane was chalked on the ramp area while undergoing an engine run-up test,” FAA spokesman Ian Gregor said in a statement.

“At some point, the plane jumped the chalks and ran into the hangar,” he said.

There were three mechanics on the plane, but no one was injured, according to Gregor.

The jet was registered to Grady International Inc. in Irvine.