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4 injured in 20-vehicle crash in Maryland, officials say

MONTGOMERY COUNTY, Md. — Four people were injured Monday morning when authorities said a tractor-trailer carrying stones and gravel crashed and lost its load on Interstate 270 in Maryland, causing about 20 vehicles to collide.

Authorities declared the accident a “mass casualty incident,” but officials said none of the people wounded suffered injuries that appeared to be life-threatening.

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