Chris Nissen, a man who captured video of the aftermath, said on Facebook that many rounds of ammunition exploded after the crash.
President Trump and the first lady offered their "deepest condolences" on Twitter.
A U.S. Marine Corps KC-130 airplane crashed Monday in a field in Leflore County, Mississippi, killing all 16 passengers on board.
The Sunflower County Sheriff’s Office told our affiliate Fox 13 in Memphis that at least eight bodies have been recovered from the scene.
The FBI was on the scene, with the Leflore County Sheriff's Department and state and local agencies, according our affiliate WPMI in Mobile, Alabama.
The U.S. Marines announced the incident on their official Twitter account.
Secretary of the Interior Ryan Zinke, a former Navy SEAL, expressed his condolences on Twitter.
Officials say they should have more information about the fatal crash later today.