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A massive train has derailed in Montana, causing at least 25 cars to crash and spill their unconfirmed contents on the ground and into nearby water.

The unknown substance is flowing into the Clark Fork River, which is located 200 miles north west of Bozeman.

Troubling images and videos have been posted to social media:

No injuries have been reported in the crash.

This crash comes less than a week after 70-car train hauling hazardous materials derailed in North Dakota.

First responders say there is no threat to the public, but it’s still unclear and unconfirmed what contents were being transported.

Montana Rail Link owns the railroad and is aware of the situation. The company that owns the train hasn’t been identified yet.

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The Sanders County Sheriff’s Office did not respond to multiple requests for comment from Fox News Digital.

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In that incident, a Canadian Pacific train derailed around 11:15 p.m. roughly a mile southeast of Wyndmere in Richland County, the company said in a statement. No injuries were reported. Officials said 31 of the 70 cars derailed, some carrying hazardous materials, and crews identified a leak of liquid asphalt. No fires were caused by the derailment.

The cleanup was expected to last between seven and 10 days, local reports said. So far, six days have passed.

Sunday’s derailment is only the latest example of a new focus on train derailments in the U.S. The issue was thrust into Americans’ minds earlier this year when a Norfolk Southern train derailed in East Palestine, Ohio, spilling toxic chemicals.

Officials chose to dispose of the chemicals with a controlled burn, causing a massive plume of smoke and requiring the nearby area to be temporarily evacuated.