A propane tank on a food truck exploded in... (Associated Press) 
 
 The Philadelphia Police and Fire Department investigate the scene of a food truck explosion in the Northeast section of Philadelphia on Tuesday, July 1, 2014. Philadelphia Police Chief Inspector Scott Small said the mother and daughter worked on the food truck and that they were in critical condition with burns across a substantial portion of their bodies. The flames briefly engulfed several cars passing near the truck, Small said, causing seven more people to be treated for minor injuries. She said that she heard the explosion and was shaken by the incident. Surveillance video from two businesses near the La Parrillada Chapina food truck captured the explosion, followed by a huge fireball that engulfed the truck and crossed to the other side of the street, Small said.  PHILADELPHIA (AP) — A propane tank on a food truck in Philadelphia exploded into a fireball, critically injuring a mother and daughter and sending at least nine others to the hospital, police said. He said the four-foot propane tank that exploded, one of two that fuels the food truck, was found about 150 feet away in a residential backyard. Officials had not determined whether the blast was accidental or suspicious, Small said. The city's fire department, along with police detectives and the bomb squad were investigating. Neighbor Luis Rivera told The Philadelphia Inquirer that his home across the street shook from the blast. "I thought it was a car accident - there are usually a lot on this street," he said. "Then I came outside and saw the lunch truck in flames." Jane Kim, the owner of a store next to the auto body shop, said that the food truck is parked outside daily. A utility pole on the other side of the street caught fire, but the fireball did not reach the homes across the street or businesses next to the truck. "We thought something fell over.
– Twelve people were hurt yesterday evening when a food truck in Philadelphia exploded in a blast so powerful its propane tank landed 150 feet away. A mother and daughter who worked on the La Parrillada Chapina truck were critically injured with third-degree burns over more than 50% of their bodies, reports the Philadelphia Inquirer. Three other people burned in the explosion are in critical condition, and seven others suffered less serious injuries when flames briefly engulfed their vehicles, police say. Surveillance video captured the moment the truck's propane tank exploded, creating a huge fireball that went all the way across the street, police say. The city's fire and police departments are investigating the blast. "We want to ensure that this was an accidental explosion. We want to ensure this wasn't anything criminal," a police spokesman tells the AP. "The bomb squad is investigating to see if there is any foul play."