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Six cars of a 100-car Union Pacific crude train derailed west of LaSalle, Colorado Friday, spilling a small amount of oil but not causing an explosion or fire.

The 100-car train was bound for New York.

According to the Greeley Tribune, the train was carrying Niobrara crude, which is less flammable than the lighter Bakken crude.

Union Pacific spokesman Mark Davis said no one was injured and a cause wasn’t immediately known.

Only one of the six cars was leaking crude. The spill was contained to a ditch off the roadway and didn’t threaten any waterways, Davis said.

Colorado Sen. Mark Udall said, “Trains hauling explosive fuels pose serious dangers to residents and businesses across Colorado. 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.”

Last week, the Department of Transportation issued an emergency order that requires railroads operating trains loaded with more than 1 million gallons of Bakken crude oil, or approximately 35 tank cars, to provide notice to State Emergency Response Commissions of the planned movement of the trains through the counties in that state.