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LA SALLE, Colo. — Six cars of a 100-car crude train derailed near Le Salle, Colo. Friday.

Clean up crews were on scene to clear the derailment. Some crude oil leaked into a ditch, officials said.

The train loaded in Windsor with Niobara crude and was headed to New York. The cars derailed around 8 a.m., officials said.

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It’s not yet known why the train derailed, reported the Greeley Tribune.

Union Pacific Spokesman Mark Davis said the spill was contained in a ditch and no waterway was threatened.

A vacuum truck was ordered to help suck up the oil.

Colorado Senator Mark Udall released a statement saying the spill is an example of why he has been pressing for the Department of Transportation to update train-safety regulations for cars carrying crude oil.

“While we are fortunate there was not an explosion, this incident in Weld County shows why I have been fighting so hard to have the U.S. Department of Transportation update its safety regulations,” Udall said. “The federal government needs to do more.”