PHILADELPHIA (CBS) — Philadelphia police are searching for a robber they say hid inside a Family Dollar store and tied up employees as they were trying to close up for the night.

It happened Monday just after 9 p.m. on the 7300 block of Frankford Avenue.

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Investigators say the robber came out of hiding and pulled a gun on two workers while they were locking up the store for the night.

Police say the robber zip-tied their wrists and then stole about $5,000 in cash and two cell phones. The employees were not injured.

Investigators are now looking at surveillance video for clues.