Four people were killed and 29 injured in a Tuesday morning crash on Interstate 25 in southern Colorado involving more than 30 vehicles, according to the Colorado State Patrol.

Four people died in a pileup involving over 30 vehicles, including six semitrailers, on an interstate in Colorado Tuesday after blowing dirt made it hard for drivers to see, authorities said.

Both directions of I-25 were shut down and local drivers were urged to delay travel until conditions improved.