Why is Israel's attack on the "Freedom Flotilla" humanitarian ship heading to Gaza considered terrorism?

Israeli Drones struck the Conscience, a ship carrying humanitarian aid in international waters, after more than two months of blockade by Israel of aid into Gaza. Freedom Flotilla Coalition organizers believe Israel, which has attacked their ships in the past, is responsible. Israel has not commented on the strikes. What does this attack mean for Palestinians in Gaza – and activists trying to break the siege?

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