KRGV.com

McALLEN - Fire officials are investigating a blaze at a warehouse in McAllen.

The fire happened early Saturday in south McAllen, officials said.

McAllen Fire Marshal Juan Salinas said they are gathering evidence they could not get before.

"At the time we used a lot of water and foam. Now it's clear. We're going to run the county K9," Salinas said.

The dog will sniff for traces of accelerants, he said.

"We look for ways ... if someone forced their way in, stuff like that. ... Evidence that was left outside the building on their way in or way out," Salinas said.

Salinas said there is little doubt the blaze was intentionally set. A burglary alarm went off at approximately 3 a.m.

"Two hours later someone called the fire department about the fire," he said.

Salinas said information gathered at the scene may help with another fire investigation. A neighboring warehouse caught fire three weeks ago. That blaze was arson, he said.

"Someone hit it with a small tool. Broke in through a small hole and lit the insulation. So it was intentionally set," Salinas said.

The building affected in Saturday's blaze did not have surveillance cameras. Investigators are pulling video from other businesses to get clues in the case.