According to reports at least four people were injured Monday morning when an Amtrak train derailed in Vermont—the second major derailment for the rail company this year.

According to reports, at least five cars on the train—known as the Vermonter—derailed about 10 miles south of Montpelier around 10:30 a.m.

A Montpelier Fire Department tells NBC two of those cars—the engine and the conductors’ car—tumbled over an embankment. The train’s conductor was reportedly injured in the fall, “but not severely.”

The four injured were reportedly transported to a local hospital, and there are no known fatalities thus far.

According to MSNBC, the derailment may have been caused by “rocks that fell on the tracks.”

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