Turkish Prime Minister Recep Tayyip Erdogan on Sunday blasted an Israeli probe's conclusion that a raid on Gaza-bound aid ships did not violate international law, saying it had no credibility.

The assault by Israeli forces on a flotilla of aid ships to prevent them from reaching Gaza killed nine Turkish activists, straining relations between the two countries.

'How can a report ordered and prepared in the same country (Israel) have any value?' the Anatolia news agency quoted Erdogan as telling journalists in Ankara.