RICHLAND TOWNSHIP, Pa. -- A Cranberry family is grieving a father and two of his triplets after a violent accident along Route 8.

Police said a wood chipper fell off the back of a truck in Richland Township Thursday evening.

The chipper then crossed the center line, smashing into a minivan.

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VIDEO: Trisha Pittman's Live Report

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Spencer Morrison, 37, Garret Morrison, 4, and Alaina Morrison, 4, were all killed instantly.

Ethan Morrison, 4, is at Children's Hospital in critical condition.

Channel 11's Trisha Pittman reported that the wood chipper is owned by O’Connor Tree Service of Middlesex Township, Butler County.

The company said the chipper was attached when they left the job site in Pine Township.

No funeral arrangements have been confirmed.

Watch Channel 11 News and refresh this page for complete coverage of this story.