NEW : `` The focus is now on Aleppo , '' UN peacekeeping chief says . -- A Syrian rebel fighter said the government was shelling a residential area in Aleppo, killing at least 10 people and wounding more than 20 others. On Wednesday , U.S. officials said President Barack Obama had signed a covert directive authorizing U.S. support for Syrian rebels . At least 130 people have been killed Thursday , opposition says . Kofi Annan leaving position as special envoy .
NEW : `` The focus is now on Aleppo , '' UN peacekeeping chief says . -- A Syrian rebel fighter said the government was shelling a residential area in Aleppo, killing at least 10 people and wounding more than 20 others. At least 130 people have been killed Thursday , opposition says . Kofi Annan leaving position as special envoy .