A landslide damaged multiple tractor trailers and closed a portion of Interstate 70 in Colorado on Monday evening.

At least two semi trucks were struck by “smart-car-sized boulders” according to Colorado Department of Transportation spokeswoman, Amy Ford.

A 24-mile stretch of Interstate 70 is closed in both directions, between mile markers 116 to 140, from Glenwood Springs to Gypsum.

Colorado DOT posted the following warning.

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The closure was put into effect on Monday evening, and was still active as of 9:19 AM CST on Tuesday. There is no estimated reopening time, however reports say it’s unlikely that the road will be reopened on Tuesday.

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The large boulders will have to be blasted with explosives before being hauled off on trucks.

You can check for the latest updates on CDOT’s Travel Alert page.