Armed with truck-mounted machine guns, Islamic State militants are going after the Syrian government.

New amateur video appears to show their offensive against government sites in Aleppo.

The fighting comes as the world convenes at the United Nations General Assembly in New York. Leaders there will discuss how to combat the extremist Sunni Muslim force.

A second video purports to show a rebel fighter from Division 13 firing on a government tank in Reef Hama.

While another video appears to show an aerial bombing using explosive barrels in western Ghouta.

Reuters cannot independently verify the videos, which were posted on social media websites.