NEW : U.N. says rebel troops to adhere to cease-fire . The rebels have agreed not to attack civilians and will allow humanitarian aid into the city of Homs, Syria's largest city, a United Nations official said. U.N. says its peacekeepers still in charge of Goma . He called for the factions to meet `` to find a lasting situation to the crisis . '' Congo says Rwandan forces join fight with minority Tutsi rebels .
NEW : U.N. says rebel troops to adhere to cease-fire . The rebels have agreed not to attack civilians and will allow humanitarian aid into the city of Homs, Syria's largest city, a United Nations official said. U.N. says its peacekeepers still in charge of Goma . Congo says Rwandan forces join fight with minority Tutsi rebels .