sentences:  Turkey demanded an Israeli apology and compensation over 31 May 2010 incident aboard the Mavi Marmara in which eight Turkish nationals and an American man of Turkish descent died when the vessel was stormed by Israeli commandos.The Israeli government refused to give one.In September 2011, Turkey expelled Israel's ambassador after a UN report found that the blockade of Gaza was legal according to international law although excessive force was used when boarding the ship.