A Toyota Sienna van rear-ended a farm tractor pulling a manure spreader on Monday causing life-threatening injuries to at least one passenger.

The Dubuque County Sheriff's Office and Peosta Police Department, along with the Farley Fire Department and EMS and Epworth EMS responded to 7815 Farley Road just after 7 pm Monday night for the two-vehicle accident.  Police say the manure spreader didn't have a slow-moving vehicle placard or any lighting.

The occupants of the van were extricated and transported to local hospitals. One occupant was later flown to the University of Iowa Hospital in Iowa City with possible life-threatening injuries. The driver of the tractor was uninjured.

None of the names of those involved are being released at this time.

The accident remains under investigation.