Organizers say climate campaigner Greta Thunberg and other activists set sail Sunday for Gaza on a ship aimed at "breaking Israel's siege" of the territory.

Climate activist Greta Thunberg and actor Liam Cunningham have joined an international group of human rights activists on a dangerous journey. The mission aims to peacefully break the Israeli blockade of the Gaza Strip while drawing attention to the region's dire humanitarian crisis.

Thunberg and 11 other activists are on board a ship headed to Gaza with aid supplies, but the IDF has said it does not intend to allow the ship to dock.