three children and a woman are dead after they were tossed from a farm tractor crash after it rolled over in Pennsylvania on Friday.

The Pennsylvania State Police said in a release just hours after the tragedy that it is "investigating" the collision, which took place around 11:00 a.m. local time in the 1100 block of Furnace Road in Lower Chanceford Township.

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"An older-model farm tractor was pulling a flatbed, open utility trailer. Twelve individuals were riding in the trailer when the operator of the tractor traveled off the roadway and over an embankment, causing the tractor and trailer to roll, killing an adult woman and three juveniles," police said.

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The PSP Troop J Collision Analysis and Reconstruction Specialist Unit, Forensic Services Unit, and Criminal Investigation Unit arrived at the scene, along with the York County Coroner.

The male driver was taken to a nearby hospital and was in serious condition, PSP said in its release.

Three children were airlifted while the others were rushed to local hospitals via ambulance, ABC27 reports.

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Five children are in critical condition at Penn State Hershey Medical Center, a police representative told local NBC affiliate WGAL. The ages of the children vary from younger than one year old to 14.