KEY WEST, Fla. (WVEC) -- A US Navy fighter jet based at Naval Air Station Oceana in Virginia Beach crashed off the coast of Key West, Florida on Wednesday afternoon. Both crew members have died.

Cmdr. David Hecht, spokesman for Naval Air Force Atlantic, said the pilot and weapons system officer ejected from the F/A-18F Super Hornet. Rescuers recovered them and they were taken by ambulance to Lower Keys Medical Center, where they were both declared dead.

The jet, which was being used for a training flight, went down around 4:30 p.m. about a mile from Naval Air Station Key West. Hecht said the F/A-18F crashed on final approach to Boca Chica Field.

The identities of both crew members are being withheld until 24 hours after the next-of-kin has been notified.

Capt. Barbie Wilson of Knee Deep Charters witnessed the crash from her pickup truck on a road near Key West.

"It happened so fast, like something out of a movie. I couldn't believe it," Wilson told the Key West Citizen . She said she saw jet flying straight, but very low.

"Then it suddenly went sideways and I heard a pop, like an explosion and I saw flames. Then it flipped and just dropped," Wilson said.

Early Thursday morning, President Donald Trump tweeted his condolences.

The Super Hornet is a twin-engine fighter jet that is larger than the single-seat F/A-18 Hornet. The jet is assigned to Strike Fighter Squadron Two One Three (VFA-213), the "Fighting Blacklions."

The cause of the crash is under investigation.

PHOTOS: Navy F/A-18 Super Hornet crashes near Key West, Florida

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The Associated Press contributed to this report