Southbound I-35W is shut down Thursday morning due to a fatal accident involving several cars.

Fort Worth police say an 18-wheeler is overturned and the accident involved five cars between Ripy Street and Seminary Drive in Fort Worth.

One person has been pronounced dead. Five people were treated for minor injuries and released at the scene.

It's unknown at this time what caused the crash.

The victim hasn't been identified.

Check back for updates on this developing story