text:  Residents of Gaza City say they are seeing some of the heaviest fighting since the Israeli invasion began. Columns of tanks were reported to be moving in from several directions. A Palestinian official has said that indirect ceasefire negotiations between Hamas and Israel are to resume in the Qatari capital, Doha. The United Nations has accused Rwanda of fuelling violence in eastern Congo. A report says Rwanda has deployed thousands of troops to fight alongside the M23 rebels.