US officials have demanded that Syria allows aid into the "starving" city of Homs, as talks aimed at ending three years of civil war hit more trouble over the future of President Bashar al-Assad.
The Syrian government said women and children could leave the besieged city and that rebels should hand over the names of the men who would remain, but a US State Department spokesman said an evacuation was not an alternative to immediate aid.
Spokesman Edgar Vasquez said: "We firmly believe that the Syrian regime must approve the convoys to deliver badly needed humanitarian assistance into the Old City of Homs now.
"The situation is desperate and the people are starving."
Syria's regime and opposition have agreed that women and children can leave the besieged city of Homs, but relations remain fragile.
Syria's future hangs in the balance ahead of tomorrow's talks. Assad will stay, the government tells ITV News
Delegates from both sides of the Syrian conflict came to the table today but appeared no closer to finding a common position.