Turkey says signal has been lost with a jet carrying the Libyan army chief and four other people.
In a post on X, Turkish Interior Minister Ali Yerlikaya says this happened at 20:52 local time (17:52 GMT) - about 42 minutes after the Falcon 50 business jet took off from Ankara's airport.
The minister says Libya's chief of staff Gen Mohammed Ali Ahmed al-Haddad was on board the Tripoli-bound aircraft.
The jet issued an emergency landing request before contact was lost.
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