UNITED NATIONS – Key world powers trying to promote Mideast peace urged Israel and Hamas on Tuesday to immediately stop fighting in Gaza and southern Israel, the United Nations announced as international efforts to calm the conflict picked up pace. The Quartet of Mideast peacemakers — the United States, United Nations, European Union and Russia — appealed "for an immediate cease-fire that would be fully respected," U.N. deputy spokeswoman Marie Okabe said. The statement came four days after Israeli warplanes started bombing in Gaza, targeting Hamas-related installations and homes in an attempt to force a halt to militant rocket attacks...