TWO HARBORS  — Canadian National is investigating what caused a train loaded with iron ore pellets to derail in Two Harbors.

CN spokesman Patrick Waldron says 76 of 107 train cars piled up in a rail yard Thursday afternoon. In addition, Waldon says another 17 cars loaded with pellets parked on an adjacent track were hit and derailed.

Two of four workers on the train were injured and taken from the scene by ambulance. Waldron says their injuries apparently aren’t life threatening.

He says heavy equipment has been brought in to clear the tracks in the CN rail yard.

Lake County Sheriff Carey Johnson says the derailment happened just after 1 p.m. on a bend in the tracks in Two Harbors.