Investigators are trying to determine what caused a massive three-alarm fire that destroyed a warehouse on the city's Northeast side early Friday morning.
The fire sparked at about 4:30 a.m. at an industrial warehouse in the 9500 block of Ball Street, near the Interstate 35-Loop 410 interchange.
The fire burned for several hours, giving crews on the scene all kinds of trouble -- from all the logistical problems, to switching out their crews and having to get more fuel.
Crews also had to deal with the contents of the building, which were plastic pallets, stacked floor to ceiling, filling the 12,000- to 15,000-square-foot facility and giving the fire more fuel to burn.
As of late Friday evening, the fire had been out for some time and crews opened up Ball Street again.
However, fire officials left one crew on the scene to continue to check for hot spots and to make sure another fire would not spark up again.
For now, arson investigators are ruling the cause as "undetermined," but they said late Friday that it was still under investigation and they will be looking more closely at the interior of the building over the next couple of days.