CARY — After two recent robberies at stores when employees were coming to work in the morning, Cary police are warning businesses to be vigilant and to call 911 if workers suspect anything unusual.

Businesses should, police urged, have at least two people assigned to open or close, and employees should be watching their surroundings as they arrive or go out and should call 911 if they see anything they think is worrisome.

Police issued their warning after a robbery Thursday morning at Dollar Express, 750-A E. Chatham St.

A heavy-set Hispanic man with a birthmark on his left cheek met two employees in the parking lot, police said. He went into the store, demanded money and ran off, authorities said.

No weapon was involved.

On Monday, two workers arrived at an Office Depot store at 2011 Walnut St., and a man forced his way into the building by showing them a gun.

That suspect got away with an undisclosed amount of cash, police said.

He is described as a dark-skinned black man, about 5 foot 6, in his mid-20s and with a deep voice. He was wearing a gray hoodie sweatshirt and black jeans at the time, Capt. Donald Hamilton said.