The buildings, the ones still standing in the Aqraba district of Damascus, are laid open after air strikes on this rebel stronghold.<br/> <br />Even more worrying, according to Human Rights Watch, are reports the bombs contain highly flammable materials like napalm and thermite --- which can cause extreme burns and long term breathing problems --- a violation of the law of war where the aim to deliver a clean and direct kill.<br/> <br />U.S. State department spokeswoman Victoria Nuland.<br/> <br />SOUNDBITE: U.S. State department spokeswoman Victoria Nuland saying:<br/> <br />"And, you can see what the regime is doing in its desperate efforts to forestall the inevitable. It is using increasingly lethal weapons and indiscriminate violence against its people."<br/> <br />Air power --- the ability to swoop in and deliver a targeted attack like this one in the capital -- is President Bashar al-Assad's true advantage against an insurgency that has matched his force on the ground with daring raids and sheer resistance.<br/> <br />Reuters cannot independently verify the content of this video which was posted to a social media website.<br/> <br />In Deir Al Zor, where rebel fighters have taken hold of a military air base, they turned their anti-aircraft guns skyward.
