A sound with which the people in Aleppo are familiar. Many families have fled as rebel fighters are trying to hold on to what territory they have here in Syria's largest city. This footage which is unverified shows armed rebels on street corners fighting back against who they say are Syrian military as best they can.

The Al-Sukkari area of the city is a shadow of its former self, shops destroyed or closed, rubbish on the roadside. Helicopter gunships overhead versus men trying to fend off Assad's vicious assault, which according to a source from Syria's state security, is going to be unlike anything already seen, all backed up by unprecedented levels of army reinforcements. An assault which the US Defense Secretary, Leon Panetta, has called a nail in Assad's coffin

Tragically people in the city are suffering: medical supplies are low, people are injured and dying and there's a desperate shortage of medical staff. This man in Al-Sukkari appears to have had some first aid for his wounded leg and he says he's thankful for what he's received so far: some basic bandages, but he's worried that he won't be able to redress it.

According to the U.N. Undersecretary-General for Humanitarian Affairs, Valerie Amos, 200,000 people have fled from the fighting in and around Aleppo these last few. Agencies are struggling to get in deliver the much-needed food, blankets, hygiene supplies and drinking water. And so the food queues are growing in these lines controlled by government troops, as men and boys wait to collect what could be for them the last loaves of bread they'll eat again for days or even weeks.