TEMPE, AZ (3TV/CBS 5) -- A thick black plume of smoke pouring off a fire in Tempe could be seen for miles Wednesday afternoon.
Interim Assistant Chief Andrea Glass of the Tempe Fire Department confirmed that it was a fire at a building under construction in the area of Scottsdale Road and the Loop 202 Red Mountain Freeway.
It eventually grew to a second-alarm fire, which calls in more resources for the fire departments battling the flames. About 100 firefighters were on scene.
"We saw the plume from the station. As soon as this thing kicked out we saw it and I gotta tell you our heart dropped a little bit," said David Fabok, lead fire inspector for Tempe Fire Department.
Fire officials say that initial reports indicate that this fire was caused when roofing materials sparked at a construction site.
[RAW VIDEO: Huge fire breaks out at construction site in Tempe]
"Braces were being welded to the metal decking causing the foam roof to ignite and spread to the available roofing materials staged on the roof," Glass said.
She said the fire was contained to the roof next to the parking garage.
"We have the metal pan decking that was being welded underneath it, then they had a foam membrane, then they had pallets with roofing material, tar paper, probably tar--we're not real sure what was up there but we know there was a lot of it, we definitely had a sufficient fuel supply up there," Fabok said.
[PHOTOS: Second-alarm fire in Tempe]
Arizona's Family first spotted the smoke plume on an ADOT camera in the area. The camera also showed police closing that exit off the Loop 202.
No one was injured in the fire.
"We come outside and the whole sky is just black. We could see flames coming through the smoke, we could feel the heat from here, it was easily 125 degrees," said Torian Smith, who works next door to the construction site.
"There was one police vehicle over here and then just everyone yelling, screaming, running around, it all happened really quick. It was fine and then it just wasn't," said Barry Kirk, who also works in the area.
According to the Department of Public Safety, both eastbound and westbound off-ramps for Scottsdale Road at the Loop 202 will be closed until about 6 p.m.
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