The UN humanitarian chief paid a short visit the battered city of Homs on Wednesday.
While in Damascus, Valerie Amos helped secure permission for a Red Cross aid convoy to reach the Baba Amro district. Relief workers have waited six days to take in essential supplies and evacuate the wounded.
Meanwhile, widespread demonstrations took place across many Syrian cities on Wednesday, according to unverified video uploaded by Syrian activists.
The protests come as former close ally Turkey called for Syrian President Bashar al Assad to step down, saying the regime was on a “dead-end road”.
“These things cannot remain as internal problems. It becomes a problem for the international community and the whole of humanity, said Turkish president Abdullah Gul.
He went onto say that Turkey no longer had any “trust in the Syrian administration”.