Rebels target a government tank (Boom) in Damascus and an air assault rattles an opposition stronghold in the erbin district of the capital.

Rebel fighters with positions around a military command center--- directing Howitzers at the building -- determined to blunt the momentum government forces have had since their victory in strategic town of Qusair.

SOUNDBITE: Rebel fighter saying:

"These shells are a gift from the Islam Brigade to Bashar and his soldiers. There are his headquarters and they are burning, at the hands of the Islam Brigade."

Fighting at this level, however, will be difficult for rebels who say they are dangerously low on weapons and ammuniciton and are struggling to deliver supplies to different brigades.

Reuters is unable to indepedently verify the content of these video which were posted to a social media wesbite.