In the videos and pictures from the derailment where part of the bridge collapsed, it was possible to see clouds of smoke rising into the morning sky under a trail of flames.
According to the Tempe fire brigade, the train was hauling unknown dangerous material.
Tempe Police Chief Police Chief Sylvia Moir called on Twitter residents to stay away from the crime scene, which she described as very dangerous.
Fire Department spokesman Brandon Siebert said officials “are on the verge of caution” and keep firefighters and spectators “as far away as possible” until they learn more about hazardous materials on the train.
According to Siebert, the operator is safe and assists gambling technicians in determining what was on the train.
“It’s possible that the derailment has resulted in a partial collapse of the bridge, but I’m not sure,” Siebert said.
According to Siebert, nearly 100 firefighters from Phoenix, Tempe, Chandler, Mesa and Scottsdale responded to the scene.