Crews in Box Elder County are on the scene of an Interstate 84 crash involving three semi trucks.
Eastbound I-84 is reduced to one lane near milepost 20, just south of the Idaho border. Westbound has been reopened.
The Box Elder Sheriff's Office says that four people were injured in the crash. One had to be flown to a hospital, but there is no word on condition.
One of the semis involved is a tanker, but no hazardous material is leaking.
Deputies don't know what caused the crash.