Syrian insurgents have breached Syria’s second largest city, Aleppo, after blowing up two car bombs and were clashing with government forces on Friday, according to a Syria war monitor and fighters. Insurgents have been approaching Aleppo city for days and have seized several towns and villages along the way. It was the first time the city has been attacked by opposition forces since 2016, when they were ousted from Aleppo’s eastern neighborhoods. The Syrian Observatory for Human Rights, a war monitor, said the insurgents blew up two car bombs at the city’s western edge on Friday. An insurgent commander issued a recorded message posted on social media calling on the city’s residents to cooperate with the advancing forces.