A two-vehicle accident north of Denver sent four people to the hospital over the weekend.

Bremer County sheriff's officials said the accident happened Sunday afternoon when a car failed to stop a controlled intersection. According to authorities, the driver of a vehicle going eastbound on County Road C-33 proceeded through the intersection at U.S. Highway 63 without stopping.

Officials identified the car's driver as Duane Flynn of Clarksville.

Authorities said Flynn's car was struck by a southbound pick-up after he ran the stop sign. They identified the pick-up's driver as Katelyn Bartels of Fredericksburg.

Sheriff's officials said both drivers were transported to nearby hospitals, as were two passengers. Authorities did not disclose the extent of the victims' injuries.

Officials indicated at least one person was flown to the hospital for treatment by AirCare helicopter.

Sunday's crash happened around 2:30 PM about eight miles north of Denver or approximately seven miles southwest of Tripoli.

The accident remains under investigation, officials said.

Bremer County sheriff's deputies were assisted at the scene by the Iowa State Patrol, Tripoli Fire, Tripoli ambulance, Tripoli police, Denver ambulance, Frederika First Responders and AirCare.

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