A flotilla carrying activist Greta Thunberg and other activists that left Barcelona for the Gaza Strip Sunday with humanitarian aid on board turned around due to stormy weather, organizers said Monday . There was no word on when they might try again.

"Due to unsafe weather conditions, we conducted a sea trial then returned to port to allow the storm to pass," they said.

The Global Sumud Flotilla intends to 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.

"The story here is about Palestine," Thunberg said at a press conference in Barcelona. "The story here is how people are being deliberately deprived of the very basic means to survive."

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