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A prominent Florida businessman and his wife, a National Rifle Association (NRA) executive committee member, say their daughter and granddaughter were among the four people killed on board a Cessna jet that flew over restricted airspace in Washington, D.C., before crashing in the mountains of Virginia on Sunday.

Barbara Rumpel, who has served on the NRA's Women's Leadership Forum, reacted Sunday night in a Facebook post for an NRA event, writing, "My family is gone, my daughter and granddaughter." On Monday morning, her Facebook page was no longer publicly available.

John Rumpel, who runs the Florida-based company Encore Motors of Melbourne Inc., to which the crashed plane was reportedly registered, told the New York Times that his daughter, 2-year-old granddaughter, her nanny and the pilot were aboard the plane.

He said that they were returning to their home in East Hampton on Long Island after visiting his house in North Carolina.

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Barbara Rumpel, her daughter and granddaughter

Barbara Rumpel, left, wrote on Facebook that her daughter, right, and granddaughter were "gone" after a Cessna aircraft crashed in Virginia with four people on board. (Barbara Rumpel/Facebook)

John Rumpel also lost his daughter, Victoria, at age 19 in a 1994 scuba-diving accident. The couple named the assisted living home, Victoria’s Landing in Melbourne, after Victoria, according to the facility’s website.

A pilot himself, John Rumpel told the newspaper that he had little information about what happened but suggested the plane could have lost pressurization, which led to the erratic flight path and crash.

authorities at entrance to trail

Authorities secure the entrance to Mine Bank Trail, an access point to the rescue operation along the Blue Ridge Parkway where a Cessna Citation crashed in mountainous terrain near Montebello, Virginia, on Sunday. (Randall K. Wolf via AP)

Authorities have not confirmed the identities of those aboard the plane or what caused the crash.

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The Cessna Citation took off from Elizabethton, Tennessee, bound for Islip, New York, the Federal Aviation Administration said. The aircraft inexplicably turned around over Long Island and flew a direct path over Washington, D.C., before crashing in the sparsely populated town of Montebello, Virginia, around 3 p.m.

Flight tracking sites showed the jet suffered a rapid spiraling descent, dropping at one point at a rate of more than 30,000 feet per minute before crashing in St. Mary’s Wilderness.

Search and rescue teams walk away from scene

Search and rescue teams leave the command post at St. Mary's Wilderness en route to the Blue Ridge Parkway to search for the site where a Cessna Citation crashed in mountainous terrain near Montebello, Virginia, on Sunday. (Randall K. Wolf via AP)

Virginia State Police confirmed to Fox News Digital that first responders reached the crash site just before 8 p.m. and found no survivors.

As the Cessna flew over Washington, D.C., the military scrambled a fighter jet that caused a loud sonic boom that was heard across the capital region. Officials said the small aircraft was not responding to radio transmissions before the crash.

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The FAA and National Transportation Safety Board are investigating the crash.

The Associated Press contributed to this report.