UPLAND (CBSLA.com) — Authorities Monday were investigating a robbery at a Payday Advance in San Bernardino County.

The incident was reportedly shortly before 9 a.m. at 637 E. Foothill Boulevard in Upland, police said.

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Two men wearing masks cut a hole in the roof of the store and reportedly ambushed an employee, tied him up and forced him to open the safe, according to a coworker.

(credit: Tom Wait/CBS)

(credit: Tom Wait/CBS)

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The suspects then stole an unspecified amount of cash before fleeing the scene.

No injuries were reported.

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No further details were released.