A delegation from Palestinian militant groups Hamas and Islamic Jihad arrived in Cairo on Sunday for indirect ceasefire talks with Israel to be conducted through Egyptian officials, Egyptian sources said.Truce talks would include Hamas' demand that Egypt ease movement across its border with blockaded Gaza. Israel said on Saturday it would not send envoys as scheduled, accusing enemy Palestinian Islamists of misleading international mediators.A U.S. / U.N-brokered ceasefire proposal broke down within hours on Friday, with Israel and Hamas trading blame. Members of the Palestinian Authority, which rules the West Bank, arrived in Cairo on Saturday.U.S. Deputy Secretary of State Bill Burns and former British Prime Minister Tony Blair are expected to fly to Cairo for the negotiations, airport sources said.Egypt, which shares a border with Gaza and like Israel opposes Hamas, has positioned itself as a mediator for the Gaza conflict.Israel began its air and naval offensive against Gaza on July 8 following what it said was a surge of cross-border rocket salvoes by Hamas and other guerrillas. Israel later also launched ground incursions.