The Global Sumud Flotilla will try to break the Israeli blockade of the Palestinian territory and bring humanitarian aid, food, water and medicine to Gaza as Israel steps up its offensive in Gaza City.

Greta Thunberg’s aid flotilla was forced to turn back to port after hitting stormy weather just hours into its journey to Gaza, organizers said Monday. The 22-year-old eco warrior was on one of 20 boats that set off for Gaza from Barcelona on Sunday on what they called the “largest solidarity mission” in history — with Israel threatening to arrest her in harsh “terrorist-level” conditions.