For a third straight week, the residents of the Baba Amr neighbourhood in Homs have endured a relentless attack from Assad's forces. Hundreds have died; thousands are injured; food and medical supplies are running desperately short. Yet the people of Homs have shown incredible bravery, taking to the streets to sing and chant their support for the foreign journalists murdered by Syrian security forces on Wednesday morning:

The deaths of the world-famous Sunday Times reporter Marie Colvin and the talented French photographer Remi Ochlik prompted a worldwide outcry. Also on that day, security forces executed seven young men who had risked their lives to bring desperately-needed medical supplies into Baba Amr.

As diplomats in Tunisia debate what to do in the face of such brutality, and a UN report concludes that Assad's snipers have deliberately targeted small children, the shelling of Baba Amr and other towns and cities across Syria continues unabated.

The bodies of Colvin and Ochlik remain in Baba Amr, and four of their colleagues are still trapped inside the city. Two of them, Edith Bouvier and Paul Conroy, are badly wounded and in need of urgent medical treatment.

Take action: Add your voice to the call for the Arab League to save Syrian lives, and donate to help Avaaz smuggle medicine, cameras and other badly-needed supplies into Syria.