Bulldozers have been clearing the way at what's left of the Southwest Inn, the scene of last Friday's massive fire that claimed the lives of four Houston firefighters.
Deputy Chief Ed Arthur of the HFD Arson Bureau says they're meticulously going through every inch of the scene.
"We got an ATF special agent in charge has committed all resources that they can give us, and they've come through with laser mapping technology. We have a time-line expert. We also have an electrical engineer from ATF, so they really come up big for us."
He says they're paying particular attention to the kitchen area for anything that may have led to the fire.
"We're going off witness statements. I can't get into what people saw at this moment. I can just say that we're concentrating in the kitchen area and above the kitchen."
Every available resource is being used in the investigation. Arthur says investigators are being motivated by the memory of the four firefighters who died.
"We're working probably pretty much from 6 in the morning here lately to 8 or 9 o'clock at night. It just depends on what needs to be done. Here lately, they've been cutting off the scene investigation around 4 o'clock or 5 o'clock in the afternoon."
Arthur says they could wrap up the on site investigation in about a couple of weeks, and all aspects will be thoroughly examined.
Meanwhile, donations have been pouring in to the 100 Club, and details are being finalized for the memorial service tomorrow morning at Reliant Stadium, where as many as 40,000 people are expected to attend.