Israel’s government has vowed to prevent an aid boat carrying Greta Thunberg and other activists from reaching the Gaza Strip.

Thunberg said she joined the Madleen crew to "challenge Israel's illegal siege and escalating war crimes" in Gaza and highlight the urgent need for humanitarian aid.

Israel on Sunday ordered the military to stop a humanitarian ship carrying activists, including Swedish climate campaigner Greta Thunberg, breaking the blockade of the war-ravaged Gaza Strip.