A man used pepper spray on an armored car driver and stole cash from the vehicle Monday, the Harris County Sheriff's Office told KHOU.

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The armored car was parked outside a Chase Bank in Houston when it was robbed at 10:51 a.m., the Houston Chronicle reported.

The guard was at the bank door when the robber approached him wearing a reflector vest and a mask, deputies said.

The robber then used pepper spray on the guard and grabbed the bag of cash he was bringing into the bank, KHOU reported. It was unclear how much money was taken, the television station reported.

The robber fled the scene in a white 2005-2009 Kia, deputies said. He is described as a tall, thin black or Hispanic man between 25 and 35 years old.