Portland, OR --Portland firefighters contained a small fire that had enormous growth potential,Wednesday night, at Westrock Recycling on SE 100th Ave & Woodstoke ST.

Neighbors heard an explosion at the plant just after 7:00pm.

"The flames like 12 to 15 feet high," said neighbor Renee Dutton who watched the fire burn from across the street.

When crews with Portland Fire & Rescue arrived they called for a second alarm because of the excess of flammable material.

"This building has a huge fire load with all the recycling materials," said Lt Tommy Schroeder. "It's inherently flammable.".

Crews quickly contained the fire and recalled the second alarm. Investigators say a mechanical malfunction in the engine compartment of a front loader sparked the fire. No one was injured.

"It's too close to home," said Dutton. "To think about such a huge fire..I/m glad they got it out quick."