TYLER, TX (KLTV) - Tyler fire investigators and the ATF Fire Investigation Team have finished their scene examination in downtown Tyler. After almost a week, investigators say the cause of Monday's massive fire is undetermined.
What they do know, the fire, which destroyed three buildings on Spring Avenue, was not intentionally set. They also say the fire started in the basement of 113 Spring Ave. That's the law office of Dan Hearst. Investigators say they went all the way to the concrete of building 113, digging out debris and pumping water, but they say there is not enough evidence to determine the exact cause of the fire.