The largest Palestinian opposition group has rejected a ceasefire declared by the Palestinian Authority. Hamas announced it would not honor a ceasefire declaration by PA Chairman Mahmoud Abbas. Abbas said on Tuesday at an Arab-Israeli summit in Egypt that the PA and all insurgency groups would end attacks on Israel. Israeli Prime Minister Ariel Sharon also announced an end to offensive military operations in the West Bank and Gaza Strip. "This expresses only the position of the Palestinian Authority," Hamas spokesman Mushir Masri said. "It does not express the position of the Palestinian movements." Hamas spokespeople said the entire movement -- whether in the PA territories or abroad -- agreed not to honor Abbas's declaration. They said Hamas would not end their attacks on Israeli targets, but did not pledge additional strikes. 