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

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.

With the fire substantially smaller since it began on Monday, police were able to access the area around the pipeline in Deer Park.