The activists had set out to protest Israel’s ongoing military campaign in the Gaza Strip, which is among the deadliest and most destructive since World War II, and its restrictions on the entry of aid.

The group, called the Freedom Flotilla Coalition, were aiming to get to Gaza carrying flour, rice, baby formula, and other basic supplies.

Israel has said Greta Thunberg is 'safe and in good spirits' after officials intercepted her 'selfie yacht' when it entered the sea close to Gaza.