The fate of the Baba Amr quarter in the Syrian city of Homs remains unclear after government troops launched a ground offensive on rebels.
Sources on both sides say government troops tried to advance on several fronts after weeks of heavy shelling.
Syrian officials say their forces are mopping up while activists say the attack had been repelled.
Meanwhile, United Nations humanitarian chief Valerie Amos says she has been denied entry into Syria.
She says she has made repeated requests to meet Syrian officials at the highest level to discuss the humanitarian situation and the need for unhindered access to those affected by the violence.