The incident happened around 8:20 p.m. Saturday at Los Bros Tacos truck on near Junipero Avenue and 7th Street.
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According to a GoFundMe created to help the business, the robbers snuck in from the backside of the truck and robbed the workers at gunpoint.
"The food truck is a FAMILY BUSINESS but the robbers did not care about the children and mother present," read the GoFundMe's description.
One of the workers was punched in the face, leaving him with a cut underneath his right eye. The suspects got away with an undisclosed amount of cash and a cell phone.
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Anyone with information is urged to call authorities.