BEIRUT (Reuters) -Syrian rebels opposed to President Bashar al-Assad said on Friday they had reached the heart of the northern city of Aleppo, after a surprise sweep through government-held towns and nearly a decade after having been forced out of the city.

Insurgents breached Syria’s second-largest city Aleppo after blowing up two car bombs on Friday and were clashing with government forces on the city's western edge, according to a Syria war monitor and fighters.

Syrian rebels launched a surprise offensive into western Aleppo, challenging years of government control and reigniting fears in a war-weary city.