Cleanup continues after train carrying 'potential contaminants' derails into Yellowstone River in Montana

Cleanup is continuing at the site where a train carrying potentially hazardous materials derailed into the Yellowstone River in Montana, according to officials.

The incident left multiple tankers in the Yellowstone River and decimated the railroad portion of the Yellowstone Twin River Bridges in Stillwater County, Montana. Officials have not indicated whether the derailment caused the bridge to collapse or whether the collapse precipitated the derailment.

Three of the railcars that derailed were carrying hot asphalt, and four were carrying molten sulfur, KC Williams, the director of Emergency Management for Yellowstone County, told ABC News.

Two impacted railcars were also carrying sodium hydro sulfate, a corrosive substance, but those substances did not enter the river, according to Montana Rail Link.

The site work and remediation that began Saturday evening continued into Sunday, Montana Rail Link Public Information Officer Andy Garland said in a statement. Track repairs have been made, enabling access to begin cleanup of the affected cars, Garland said.