Italy’s coast guard service has been looking for a missing F-16 US fighter jet off the country’s Adriatic coast.
Italian and US aircraft are also involved in the search for the jet and its pilot, believed to have been the only person aboard.
Air traffic control lost contact with the F-16 on Monday evening, but fog and darkness hampered the search.
The US military said the plane took off from Italy’s Aviano air base on a training mission over the Adriatic Sea.
Italian media has reported that a fishing boat picked up some pieces of debris that could be parts of a US Air Force plane.
Aviano is the base for the 31st Fighter Wing. The US Air Force said a board of officers would investigate the incident.
“Wing leadership remains hopeful that we will safely rescue our pilot,” an Air Force statement said.