The leader of Syria’s most powerful insurgent group has toured the seized city of Aleppo in a surprise visit, for the first time since the group captured large parts of the city last weekend, as fierce fighting intensifies in the government-led counter-offensive in northern Hama.

By Maya Gebeily and Suleiman Al-Khalidi BEIRUT/AMMAN (Reuters) -Syrian rebels advancing against government forces pushed close on Tuesday to the major city of Hama, rebels and a war monitor said, after their sudden capture of Aleppo last week rocked President Bashar al-Assad.