President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on Thursday mourned the crew members killed in a fatal fighter jet crash off the coast of Key West, Fla., calling for "thoughts and prayers" for the service members, who were killed after ejecting from the plane.

"Please join me with your thoughts and prayers for both aviators, their families and our incredible @ USNavy," Trump wrote on Twitter.

Please join me with your thoughts and prayers for both aviators, their families and our incredible @USNavy. https://t.co/60bHhrp8Y1 — Donald J. Trump (@realDonaldTrump) March 15, 2018

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The F/A-18 fighter jet crashed into the water near a naval station on Wednesday during a training mission, the Navy said.

The pilot and weapons system officer on board were recovered from the water by rescue crews, and were taken to a nearby hospital. The Navy later said that the two crew members had died.

Their aircraft was assigned to the Strike Fighter Squadron 213 based at Naval Air Station Oceana in Virginia Beach, Va. Investigators are looking into the cause of the crash, the Navy said.

"We are sad to report that both aviators have been declared deceased," the Navy wrote in a tweet on Wednesday. "Their families are in our prayers. Per policy, we will withhold notification pending [next of kin] notification."