A Virginia State Police helicopter crashed Saturday in Albermale County, Virginia, near the city of Charlottesville, where a violent white nationalist rally was taking place.

The troopers killed were identified by Virginia Gov. Terry McAuliffe as Lt. H. Jay Cullen and Trooper-pilot Berke M.M. Bates.

The Bell 407 helicopter crashed seven miles southwest of Charlottesville, the FAA confirmed to CBS News. There are two confirmed fatalities, the Virginia State Police posted on their Facebook page. Both the people killed were on board.

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President Trump tweeted Saturday night his "deepest condolences" to the family and fellow police officers after the crash.

Deepest condolences to the families & fellow officers of the VA State Police who died today. You're all among the best this nation produces. — Donald J. Trump (@realDonaldTrump) August 12, 2017

The National Transportation Safety Board (NTSB) is investigating.

Witness Ben Ward told CBS News' Bo Erickson that he saw the plan "circling unnaturally" before it went down "in a tail spin."

Emergency crews were responding, according to CBS affiliate WCAV-TV.

Scene near helicopter crash. pic.twitter.com/ySSce96L2r — Dan Schutte (@schuttedan) August 12, 2017

A video from social media showed flames near a golf course.

Helicopters were reported flying overhead in Charlottesville as McAuliffe declared a state of emergency after what is believed to be the largest gathering of white nationalists in a decade. At least one person was killed and 19 injured when a car plowed into a group of counter-protesters.

Officials told the Associated Press the Virginia State Police helicopter was assisting with the rally.