Prime Minister Benjamin Netanyahu has told an internal Israeli inquiry that the raid on a Gaza-bound aid flotilla in May was lawful.
Netanyahu is the first witness to testify before the state-appointed panel. The Defence Minister and head of the military are also expected this week.
Nine Turkish activists died after Israeli commandos intercepted the flotilla in international waters.
Israel says its warnings not to continue to blockaded Gaza were ignored and live fire was used only after attacks by those on board, who, it says, were clearly prepared for violence.
Meanwhile, the ship at the centre of the inquiry has arrived back in Turkey after being impounded in Israel.
Shattered windows were visible on the bridge of the Mavi Marmara. Activists claim the vessel had been freshly painted in an attempt to disguise damage incurred during the raid.
Turkish investigators will examine the ship later today.