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F-16 fighter jet missing over Adriatic Sea

An F-16 fighter jet went missing Monday after losing connection with its base in Italy around 8 p.m. local time, the U.S. Air Force said in a statement.

Pentagon officials confirm the plane, out on night operations training, is down in the Adriatic Sea, the body of water that separates the Italian peninsula from Croatia and Albania. The plane was assigned to the 31st Fighter Wing at Aviano Air Base in Italy.

The pilot is missing, according to Pentagon officials.

Search efforts are underway, the Air Force said.

--Reporting by Jim Miklaszewski and Isolde Raftery of NBC News.