"Until today noon, there has been no concrete step taken for any operation of this type in Homs Old City," Robert Mardini, head of operations for the Middle East at the International Committee of the Red Cross (ICRC), told AFP.
Yesterday at the UN-brokered negotiations in Geneva, Syria's regime agreed to allow women and children safe passage from rebel-held areas of the city of Homs where they have been under siege for nearly 600 days, with near-daily shelling and the barest of supplies.
Opposition activists in Homs expressed scepticism, however, saying they first wanted aid supplies and "guarantees" that those leaving would not be arrested.
More than half of the 500 women and children trapped in Homs refuse to be evacuated, saying they fear leaving male relatives behind, activists said today.
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Some 3,000 people are thought to be trapped in Homs' rebel-held areas, according to rights groups.
In Geneva, opposition spokesman Monzer Aqbiq said offering civilians the chance to leave a besieged community should not mean that they must do so.
US State Department official Edgar Vazquez echoed that.
"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," Vazquez said in a statement.
"An evacuation is not an alternative to badly needed humanitarian assistance," he said.
Forced evacuations can breach the laws of war, notably the Geneva Conventions overseen by the ICRC.
"We know from our experience that people will not wish to leave their homes, their personal belongings," he added, saying aid agencies should be allowed in to assess needs.
"There won't be any quick wins. We should be under no illusion that this will solve the problem. And access is not a one-off, where you get in with some food parcels and medical aid," he said, noting that longer-term relief efforts would be essential.