Swedish climate activist Greta Thunberg and Game of Thrones actor Liam Cunningham will join the next sailing of the Freedom Flotilla Coalition (FFC) as it attempts to break Israel’s months-long blockade of Gaza.

The “Madleen” is due to disembark from Catania, Sicily, on Sunday with a cargo of humanitarian aid and several high-profile activists on board, including Thunberg, European Member of Parliament Rima Hassan and Palestinian-American lawyer Huwaida Arraf.

Cunningham, an Irish actor best known for his role as Davos Seaworth in the hit HBO series, is a longtime advocate for Palestine and similar causes.

The sailing marks the second attempt in as many months by the FFC, a coalition of humanitarian groups, to reach Gaza.

A mission at the start of May was aborted after another FFC vessel, the “Conscience”, was attacked by two alleged drones while sailing in international waters off the coast of Malta.

The FFC alleges that Israel was responsible for the attack, which severely damaged the front section of the ship.