Palestinian leader Mahmoud Abbas is due to meet with terror chiefs in the Gaza Strip, in an effort to enforce an unraveling cease-fire with Israel. He warned the leaders of Hamas and Islamic Jihad that further violations of the truce will not be tolerated. Hamas gunmen fired more than 50 mortars and rockets at Jewish settlements in Gaza yesterday, in a major challenge to the new Palestinian leadership. "The Palestinian Authority will not tolerate any actions that will sabotage the agreement reached with the Israelis on a mutual cease-fire," said Cabinet Secretary Hassan Abu Libdeh. “There is only one Palestinian Authority and one leadership, and it will not accept any acts that can endanger our national project."