Conditions inside Syrians are worsening for ordinary citizens who have faced weeks of government shelling and sniper fire, and remain besieged inside their homes.
Food and water are running out in many of the opposition-held towns that have been targeted by the Syrian government guns.
The ongoing need for medical care has also been highlighted in video appeals by Western journalists.
Sunday Times cameraman Paul Conroy made an appeal for help, after wounding his leg in three places during the attack that killed his colleague, journalist Marie Colcin. French photojournalist Remi Ochlik was also killed.
French reporter Edith Bouvier was badly injured in Wednesday's attacks on Baba Amr district, outside Homs. She pleaded for a ceasefire in a YouTube video uploaded by opposition activists on Thursday, requesting a medically equipped vehicle to help her get to the Lebanese border so she could receive the treatment she needed.
As senior politicians gather in Tunisia to discuss how to get humanitarian aid into the country, the tales from inside Syria are becoming more and more desperate.
Medics are reportedly having to use threads from clothing to stitch up wounds, while houses are becoming more and more uninhabitable, windows knocked through and walls crumbling after heavy shelling.
With night temperatures dropping below zero, the lack of shelter is a crisis in itself. Edith Bouvier's colleague, photo journalist William Daniels, explains in the video that there is no electricity and they are running out of food. The journalists' appeals have been made in the semi-darkness, in houses with windows boarded up. Medics can be seen scrambling over sofas in the makeshift conditions.
The UN has drawn up a list of Syrian officials to be investigated for crimes against humanity, to be presented to officials at the 'Friends of Syria' conference on Friday.
William Hague said at the conference that the UK was "determined to pursue every possible peaceful means of pressurising Assad's regime until it ceases its brutal repression of the Syrian people
"The UK looks forward to working closely with Arab and international partners to end the violence and begin the process of transition that the Syrian people deserve."
US Secretary of State Hillary Clinton said she was certain the Syrian regime would fall but that getting aid in was a priority.
"Our immediate focus is on increasing the pressure. We have got to find ways of getting food, medicine and other humanitarian assistance into those affected by violence. But this takes time and it takes a lot of diplomacy," she told reporters.
"The strategy followed by the Syrians and their allies is one that can't stand the test of legitimacy or even brutality for any length of time.
"There will be increasingly capable opposition forces. They will from somewhere, somehow, find the means to defend themselves as well as begin offensive measures.
"It is clear to me there will be a breaking point. I wish it would be sooner, so that more lives would be saved, than later, but I have absolutely no doubt there will be such a breaking point."
Children that have managed to make it past the border into neighbouring countries are still suffering from the trauma they experienced inside Syria. A BBC journalist spoke to one man who had fled to Jordan, saying that his children still flinch when they hear loud noises, asking if they are gunfire.
Ordinary civilians including women and children have been killed in the shelling, while protesters have been tortured as they lie injured in hospital. The latest pictures from inside Syria show the extent of the destruction, 11 months into the crisis (most recent pictures first).
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