Turkey's prime minister is appealing to Israeli and Palestinian leaders to end the violence in the Gaza Strip that has resulted in the deaths of more than 100 Palestinians. Recep Tayyip Erdogan told Prime Minister Ehud Olmert on Monday that Israeli attacks on Gaza were "unacceptable" and renewed an offer to mediate between the sides, his office says. He also called Palestinian Authority President Mahmoud Abbas on Sunday and urged "moderation," his office says. Israel launched the offensive in response to salvos fired by militants. On Sunday, Erdogan accused Israel of using "disproportionate force" in Gaza. Turkey is one of Israel's closest allies in the Muslim world and also has good ties with the Palestinians.