Once again, the Israeli Navy has attacked an unarmed aid ship in international waters. This, like the attack on the Mavi Marmara, is an act of piracy, pure and simple.
Details are skimpy at this time, but a vessel of the Egyptian navy was apparently also involved, which shows how much the "peaceful revolution" has really changed things in Egypt. The Egyptian government and military are still Israel's puppets.
As I said, details are still scanty at this time, but the vessel was intercepted and fired upon in international waters, which is the definition of piracy.
More information here