Firing from helicopters marks `` a very serious escalation , '' Nuland says . U.N.-Arab League envoy seeks protection of civilians , access for U.N. observers . Opposition activists said at least 93 people were killed across the country Monday , 35 of them in Idlib . ` The opposition Syrian National Council shakes up its leadership . - A suicide bomber kills at least 12 people in the northern city of Aleppo, according to state media.
Firing from helicopters marks `` a very serious escalation , '' Nuland says . U.N.-Arab League envoy seeks protection of civilians , access for U.N. observers . The opposition Syrian National Council shakes up its leadership . - A suicide bomber kills at least 12 people in the northern city of Aleppo, according to state media.