TRAVEL ADVISORY - AGAIN THIS YEAR: Terror warning for Djerba Lag B'Omer celebration. Counterterrorism Bureau sharpens current travel warning for Tunisia following terrorist motivation increase to attack Jews. A synagogue has reportedly existed at the same site on the island of Djerba since antiquity, but I have not been able to locate any sources or evidence so far. The current synagogue has been there since the 19th century.
There have been similar terrorism warnings for Djerba at Lag B'Omer in the last couple of years, but everything proceeded safely nonetheless. Let's hope for the same this year. Background here, here, here, here, and links.