A vehicle crashed into a gas pipeline valve, exploding into a tower of flame that burned for days. Investigators are now looking into whether it was more than an accident.

"The fire continues to burn itself out this morning, which is the safest way to manage the incident," the City of Deer Park said.

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.