Israel vowed on Sunday to stop an aid boat carrying Greta Thunberg and other activists on board from reaching Gaza.

Greta Thunberg and other activists are on the Madleen, a British-flagged boat operated by the Freedom Flotilla Coalition, on which they intend to reach the Gaza Strip

The almost 20 months of war has torn Gaza apart, often displacing residents multiple times and killing more than 54,000 people, according to the Hamas-run Health Ministry. A U.S.-brokered ceasefire agreed in January collapsed in March as Israel enforced a blockade on all humanitarian aid into the strip.