(AP) — The cold weather in North Dakota kept chemicals that spilled from a derailed Canadian Pacific train from spreading very far, authorities said.

Richland County Emergency Management Director Brett Lambrecht said Tuesday that with temperatures well below freezing all of the chemicals that leaked remained within about 100 feet of the derailment that happened Sunday night in a rural area about 60 miles (97 kilometers) southwest of Fargo. The high temperature in the area was forecast to reach only 17 degrees Fahrenheit (-8 degrees Celsius) Tuesday.

“The weather conditions helped a lot,” Lambrecht said.

No injuries or fire were reported in the derailment and no one had to be evacuated in the two nearby farmhouses or in the town of Wyndmere a couple of miles away. There are no waterways near the derailment.

Lambrecht said that the liquid asphalt and ethylene glycol that spilled from six railcars involved in the derailment mostly hardened and remained on the surface of the ground because of the cold weather. Some propylene gas also leaked from a tank car that was punctured in the crash, but officials were able to patch the leak on that car. He said the liquid asphalt looked like “sheets of black plastic” after it froze.

Officials aren’t yet sure how much of the chemicals spilled, but none of the railcars that leaked spilled all their contents.

A total of 31 of the 70 cars on the train derailed. Canadian Pacific officials have said they believe a broken rail caused the derailment.

The railroad was able to clear the tracks and resume running trains through the area Monday evening, but Canadian Pacific is still working on clearing all the damaged cars from the site.

“It has been a good fast recovery really when you look at it,” Lambrecht said.

The cleanup of the chemicals is expected to take about two weeks. The railroad’s own hazardous materials experts are working with local officials.