7. Under international maritime law, when a maritime blockade is in effect, no boats can enter the blockaded area. That includes both civilian and enemy vessels.
8. A state may take action to enforce a blockade. Any vessel that violates or attempts to violate a maritime blockade may be captured or even attacked under international law. The US Commander's Handbook on the Law of Naval Operations sets forth that a vessel is considered to be in attempt to breach a blockade from the time the vessel leaves its port with the intention of evading the blockade.
9. Here we should note that the protesters indicated their clear intention to violate the blockade by means of written and oral statements. Moreover, the route of these vessels indicated their clear intention to violate the blockade in violation of international law.
10. Given the protesters explicit intention to violate the naval blockade, Israel exercised its right under international law to enforce the blockade. It should be noted that prior to undertaking enforcement measures, explicit warnings were relayed directly to the captains of the vessels, expressing Israel's intent to exercise its right to enforce the blockade.
Official response from the Israel Ministry of Foreign Affairs