PHILADELPHIA - Police say a propane tank on a food truck exploded in Philadelphia, injuring at least 11 people including a mother and daughter who are in critical condition.

The La Parrillada Chapina truck exploded Tuesday outside an auto body shop in the city's Feltonville neighborhood.

Philadelphia Police Chief Inspector Scott Small says the mother and daughter worked on the truck and suffered substantial burns. Two others also are in the hospital in stable condition and the remaining victims have been treated and released.

Small says surveillance video from businesses near the La Parrillada Chapina food truck shows a huge fireball engulfing the truck and crossing to the other side of the street.

The city's bomb squad is investigating the explosion.

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