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An aerial view of Fort Drum is seen in this file photo. Six soldiers were injured Thursday at the Army post.

(File Photo )

FORT DRUM, N.Y. -- Two Fort Drum soldiers remain at a local hospital with injuries sustained from a lightning strike on the base Thursday night.

Four others have since been released from the hospital and returned to duty this morning, said Julie Halpin, director of public affairs at Fort Drum. Halpin described their injuries as minor and non-life-threatening.

The soldiers, from the 4th Battalion, 31st Infantry Regiment, 2nd Brigade Combat Team, were conducting a training exercise around 9 p.m. when lightning struck.

"We must train in all weather," Halpin said.

Multiple weather alerts warning the soldiers of severe weather were in effect at the time, Halpin said.

In the case of a weather alert, soldiers are told before going out for training to take cover as necessary and to stay away from tall buildings or antennas. Training can also be delayed or cancelled due to a weather alert, Halpin said.

It's unclear if the six soldiers were under the cover of a sturdy structure at the time of the strike, Halpin said, saying that much of the base's 107,265 acres is open land.

The last time soldiers were injured due to lightning at the base was in August 2012, when 10 New Jersey Army National Guard soldiers suffered minor injuries while training at Fort Drum.