The large number of deeply divided rebel groups is one of the main obstacles to a U.N. mission's efforts to broker an end to Syria's 18-month crisis, the Damascus representative of the new international envoy said Monday. Activists reported an air raid on a northern town killed at least 21 people.
The Syrian foreign minister accused the U.S. and its allies of stoking "terrorism" in his country, delivering an uncompromising message before the United Nations on Monday as fighting spread in a centerpiece of Syria's cultural heritage, the historic Old City of Aleppo.
