VIDEO: A taco truck in downtown Los Angeles was seriously damaged in a fire, and the owner suspects it was an act of arson. The incident happened around 11 p.m. Tuesday near Grand Avenue and Olympic Boulevard, according to the Los Angeles Police Department. Responding firefighters quickly extinguished the flames. The owner of Danny's Tacos says a customer saw someone running from the truck after the fire started. Cellphone video shows a masked man with a gas can arguing with another person moments before the taco truck went up in flames. Abel Antonio and several of his family members run the truck. He said that someone threatened them a couple weeks ago. Antonio said his pregnant sister was running the truck at the time and is still shaken up. The LAPD and LAFD are investigating the incident. Nobody was hurt.