The IDF soldiers who landed on the deck of the Mavi Marmara opened fire in self-defense after forty minutes of this:
Update [12 Jul 2010 1050 PDT]: Initial reports which said that the IDF commandos waited 40 minutes to open fire are incorrect. Apparently the second soldier to land on the deck was fired upon with a gun taken from the first one — or perhaps his own gun was taken. The Israelis fired back within a few minutes of landing. All in all there were at least four cases of live fire directed at IDF soldiers. In one case a soldier was wounded in the knee by a non-IDF bullet, and cartridge cases from non-IDF weapons were found on the deck.