HINTON, Iowa (AP) — Two people were seriously injured in a northwest Iowa grain elevator explosion. The Sioux City Journal reports the explosion occurred just after 1 p.m. Thursday at Central Valley Ag in Hinton. Plymouth County Sheriff Mike Van Otterloo says two people were taken to a Sioux City hospital in serious condition. Authorities have not identified the victims, and the cause of the explosion hasn’t been determined.

U.S. Highway 75 and a county road were closed through Hinton to allow emergency crews to quickly reach the grain elevator, but the roads were later reopened. Authorities had asked that trains not travel through the area but rails also were reopened.