A 6-year-old girl was critically injured in a head-on crash involving two vehicles Saturday morning in Stacy, Minn., and alcohol is believed to have been a factor in the wreck, authorities said.

The girl was a passenger in the back seat of a vehicle that was struck about 10:35 a.m. on Stacy Trail near Falcon Avenue. She was flown to a trauma center where she was being treated for life-threatening injuries, the Chisago County Sheriff's Office said.

Three other people in the car the girl was riding in also were hurt and taken to hospitals, but are expected to survive, the sheriff's office said.

A 39-year-old man driving the other vehicle was taken to a hospital and later booked into the Chisago County jail. The man was being held on suspicion of driving while intoxicated and criminal vehicular operation, jail records show.

No other details about the crash were released, but "alcohol is suspected," said Captain Derek Anklan, with the Chisago County Sheriff's Office.