NEW : `` The focus is now on UN , '' Aleppo peacekeeping chief says . Rebels are now equipped with heavy weaponry , including tanks , the United Nations said , a sign that the armed resistance to President Bashar al-Assad 's regime is gaining military potency . Rebels , government trade accusations over a refugee camp attack . 15 people have been killed the next 12 months , opposition says . Ammar Al-Wawi leaving position as special envoy .
NEW : `` The focus is now on UN , '' Aleppo peacekeeping chief says . Rebels , government trade accusations over a refugee camp attack . 15 people have been killed the next 12 months , opposition says . Ammar Al-Wawi leaving position as special envoy .