YORK COUNTY, Pa. – A woman and three children have died and more people have been injured after a farm tractor pulling an open flatbed trailer overturned in south-central Pennsylvania late Friday morning, authorities said.

The crash occurred around 11:30 a.m. when an “older-model farm tractor” pulling a trailer carrying a dozen people traveled off the roadway and over an embankment, causing the tractor and trailer to roll, according to a Pennsylvania State Police press release.

The woman and three children died. Nine others were taken by ambulance or helicopter to local hospitals, police said.

The incident happened in Lower Chanceford Township in southern York County, about 60 miles west of Philadelphia.

An adult man who was driving the tractor was also transported from the scene and was in serious condition.

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State police said the man driving the tractor pulling the trailer lost control before traveling off the road.

The children ranged in age from one to 14 and their conditions vary, state police said. 

No other vehicles were involved.

“Our hearts go out to the families of the juveniles and all the individuals involved,” Lt. Adam Reed said during a news conference. “It’s a very tough day for everyone down there.”