GRANADA HILLS (CBSLA.com) — A robber is on the run after making off with a bag of cash from a Brinks armored truck in Granada Hills Tuesday.

The heist happened at about 11 a.m. after the messenger got out of the truck to make a delivery at the CVS store at Chatsworth Street and Zelzah Avenue.

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Police said a man with a gun approached the Brinks employee and demanded a bag of money and his gun. The messenger complied. The thief took off with the cash and the weapon.

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The messenger quickly jumped back into the Brinks truck. He and the driver chased after the robber but could not keep up.

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Police said the bandit was wearing a gray hooded sweatshirt and jeans. His face was covered with a piece of cloth or bandana.