More than a dozen people were injured Thursday in an explosion at a soybean processing plant in Marengo.
Hospital personnel said they treated about 15 people with minor to moderate burns.
There were 30 people in the plant when the blast occurred, and all were accounted for, according to KCCI.
"This was a hazmat situation. This is a biofuel plant, from my understanding. With that, we look at what is possibly in there, we try and figure out what chemicals are there. Look at the hazmat guide and say, ‘OK we want to evacuate these people,'" Iowa State Trooper Bob Conrad told reporters.
Firefighters were using foam to quell the flames.
