"The Freedom Flotilla Coalition, which organized the latest ship, says the Madleen was intercepted in international waters some 200 kilometers (124 miles) off the coast of Gaza, a claim that could not be independently verified. Israeli authorities have not disclosed the location where the ship was halted.
Robbie Sabel, an international law expert and former legal adviser to the Israeli Foreign Ministry, said 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."
They were siezed over 10x the distance from Israeli waters where Israel had no jurisdiction.
https://apnews.com/article/israel-gaza-flotilla-greta-thunberg-legal-65ff69bd2eb19d8c587a70294ce499bd
"The Freedom Flotilla Coalition, which organized the latest ship, says the Madleen was intercepted in international waters some 200 kilometers (124 miles) off the coast of Gaza, a claim that could not be independently verified. Israeli authorities have not disclosed the location where the ship was halted.
Robbie Sabel, an international law expert and former legal adviser to the Israeli Foreign Ministry, said 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."