The cause of Thursday’s explosion at Northwood AG Products fertilizer storage that contains sulfuric acid is undetermined, according to Worth County Emergency Management Director Ray Huftalin.
The explosion, which forced the evacuation of Northwood’s approximately 2,000 residents for most of the day, occurred around 7:30 a.m. Thursday.
Residents were given the all-clear about 4 p.m. U.S. Highway 65 was re-opened at approximately 3:15 p.m. Thursday.
Considering the number of people involved, the evacuation went well, Huftalin said.
Four Northwood residents were treated at Mercy Medical Center-North Iowa Thursday morning following the fire.