Officials say human remains have been found inside an SUV that authorities say hit an aboveground valve on a pipeline in suburban Houston, causing a fire that has burned for four days.

The Deer Park Police Department said the incident involving a vehicle that crashed into a natural gas pipeline in Houston, Texas and ignited a massive fireball is now a criminal investigation.

As of Tuesday morning, the fire caused by an exploding pipeline in a Houston suburb continued to burn itself out, according to officials.