"The leadership of Hamas surrendered to the Jews, most of Palestine" in order to keep leadership of the Palestinian government, he said.
Hamas and Fatah agreed a month ago to forge a coalition cabinet, largely ending factional fighting centred in the Gaza Strip where more than 90 people died.
"But what government? A government that doesn't even have the right to enter or leave [the Palestinian territories] without Israeli permission."
He said: "The leadership of Hamas government has committed an aggression against the rights of the Islamic nation by accepting what it called ... respecting international agreements.
"I am sorry to have to offer the Islamic nation my condolences for the [virtual demise] of the Hamas leadership as it has fallen in the quagmire of surrender."
Hamas, which came to power in January 2006, refuses to recognise Israel a stance which has led to Western countries boycotting the Palestinian government, led by Hamas after its electoral win in January 2005.
His comments were broadcast as Ehud Olmert, the Israeli prime minister, and Mahmoud Abbas, the Palestinian president and head of Fatah, were reported to have made little progress during talks on key issues in Jerusalem.
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