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Crews are still cleaning up after two Canadian Pacific Kansas City trains derailed in Minnesota and North Dakota earlier this week.

Several hazardous materials cars were among the 24 cars that toppled in the Minnesota derailment Wednesday in the northwest corner of the state near the Canadian border. The North Dakota derailment near Balfour Tuesday afternoon knocked several cars carrying shipping containers that did include several hazardous materials such as lithium batteries off the tracks. But no toxic chemicals spilled and no injuries were reported in either derailment.

A spokeswoman for the railroad said Canadian Pacific Kansas City's hazardous materials experts were continuing to work with first responders Thursday to clean up the mess in Minnesota, and it wasn't immediately clear when highways in the area and the train tracks will reopen.

FIVE EMPTY NORFOLK SOUTHERN TRAIN CARS DERAIL IN PITTSBURGH

The tracks in North Dakota reopened early Wednesday after crews cleared the derailed cars.

Signage outside a Canadian Pacific Railway

A sign is shown outside a Canadian Pacific Railway rail yard in Alberta, Canada, on March 22, 2021. Two Canadian Pacific trains derailed in Minnesota and North Dakota earlier in the week. ( Alex Ramadan/Bloomberg via Getty Images)

The cause of both derailments remains under investigation.

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Railroad safety has been a concern nationwide after several recent derailments, including a fiery February train wreck near East Palestine, Ohio. Congress is considering several new safety requirements for freight railroads, which have already committed to making some changes in their operations. Federal regulators have also urged railroads to take additional precautions to prevent derailments.