JACKSONVILLE, Fla. -

Flames engulfed a food truck on Interstate 95 south at the Emerson Street exit on Wednesday morning.

The Lewey's Mobile Crab House food truck was parked on the shoulder just after 11 a.m., as fire was seen coming from the back of the truck.

It's unclear how the fire started or if there were any injuries.

Two lanes of I-95 south were closed for a short time.

The video was posted to the WJXT4 The Local Station Facebook page.

Lewey's Mobile Crab House fire,  comes just one day after a terrible explosion that consumed a food truck in Philadelphia. The quick and violent blast was caught on surveillance video.

Investigators in Philadelphia believe a propane tank caused the explosion. Witnesses said they saw one of the tanks fly across the street, which started a separate but minor fire.

13 people were injured in the blast in Philadelphia, including two people who are in critical condition. One woman has  first-degree burns on the left side of her body from the flames.

Now that fire is raising questions about food truck safety in Philadelphia and other cities.

News4Jax looked into safety requirements in Jacksonville, according to the Florida Department of Business and Regulation: 

* Food truck vendors must undergo one health inspection a year.

* They cannot cook raw food.

* If they use a smoke cooker, they must be enclosed with a hinged door or lid.

* They must have proper waste containers to dispose of food scraps and liquids.

* Each food truck is required to have at least one fire extinguisher, as well as an automatic fire suppression system over cooking equipment if grease is used.

Food truck safety regulations differ among cities and states. The cause of what happened in Philadelphia is still not clear. Investigators have yet to determine what caused that food trailer on I-95 to catch fire.