Israel's foreign ministry posted a video on X on Wednesday showing activist Greta Thunberg after Israel had taken control of a vessel part of a flotilla she was on.

In a statement, the Foreign Ministry said that Thunberg and "her friends are safe and healthy."

The ministry added that Israel had stopped several vessels and transferred passengers to an Israeli port.

The Global Sumud Flotilla, with Thunberg, Nelson Mandela's grandson, Mandla Mandela, and several European lawmakers aboard, consists of nearly 50 boats and 500 activists and is carrying a symbolic amount of humanitarian aid.

It has remained undeterred in its mission to break the Israeli blockade of the coastal strip and reach Palestinians.

Greg Stoker, an American veteran aboard one of the boats in the flotilla, said around a dozen naval vessels with their transponders off had approached it.

The Israeli Foreign Ministry said on X that the navy had reached out to the flotilla to ask them to change course and to warn them that they are approaching “an active combat zone.”

It reiterated its offer to transfer the aid to Gaza through other channels.

Those calls were echoed by other European governments, including Italy, which had sent a navy ship to follow the flotilla for part of its journey but stopped as they got closer to Gaza's shores.

The U.N. Convention on the Law of the Sea stipulates that a state only has jurisdiction up to 12 nautical miles (19 kilometers) from its shores.

In general, states don’t have the right to seize ships in international waters, though armed conflict is an exception to this.

Israel’s government has accused some of the flotilla members of being linked to Hamas, while providing little evidence to support the claim.

Activists have strongly rejected the accusations and said Israel was trying to justify potential attacks on them.