KNOXVILLE, Tenn. (WATE) — A mail carrier is in critical condition after their mail truck was hit by a train Wednesday afternoon in Knox County, Tennessee.

The collision occurred at a railroad crossing in the 900 block of Zola Lane. A spokesperson for Knox County Rural Metro Fire said the mail truck was hit and pushed about a half-mile by the train before coming to a stop.

The postal worker was transported to the hospital with what appeared to be life-threatening injuries, a Knox County Sheriff’s Office spokesperson said.

United States Postal Service personnel was also on the scene securing the mail.

Investigations will be conducted by the Knox County Sheriff’s Office, the railway company and the postmaster.