Insurgents have breached Syria's second-largest city, Aleppo, clashing with government forces, according to a Syria war monitor and fighters.

Islamist rebels breached neighborhoods in Syria’s second-largest city of Aleppo and clashed with government military forces after detonating two car bombs Friday.

It was the first time the city has been attacked by opposition forces since 2016, when they were ousted from Aleppo.