HOUSTON -

A firefighter was injured after a 2-alarm fire in downtown Houston Thursday morning.

Around 2:00 a.m., Houston firefighters arrived at the shuttered Harris County probation office on Dart and Elder.

Flames were shooting from the roof when crews arrived on scene.

Ladder trucks sprayed down the building as crews went inside to fight the fire.

The flames were so intense they pulled a second alarm, which brought out more units.

While inside, a heavy roof tile fell on a firefighter battling the flames.
It hit his helmet and then his shoulder. 

He was taken to Memorial Hermann Hospital in stable condition.

Most of the damage, was contained to the third floor.

Because the fire was inside a vacant building, it is considered suspicious.

Arson teams were called in to look through debris and figure out what started the fire.

Houston Fire Chief Jay Evans said the building dated back to the twenties.
He said the building is, "probably where medicine started in Houston and Harris County.  Now it has progressed to what we know as the Texas Medical Center."