A convenience store employee thought a customer was joking around when he pulled a gun and demanded money from the cash register Sunday afternoon in east Fort Worth.
But then the gunman became aggressive, police said.
The customer entered the store in the 6700 block of E. Lancaster Avenue at 3:30 p.m. and pulled out a pistol, said Lt. Paul Henderson, police spokesman.
"He demanded money and threatened to shoot the clerk," Henderson said. "The clerk thought it was a joke at first until the man became aggressive.
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"The clerk opened the register and the suspect grabbed up the cash from the drawer."
He ordered the clerk to the floor and then left in a maroon Dodge Ram truck that was driven by another person, Henderson said.
The robber was a white male with short, black hair, 5-feet-10-inches tall and about 160 pounds, and multiple tattoos on his arms, Henderson said.
Anyone with information about the crime can call robbery detectives at 817-392-4370.