The International Committee of the Red Cross has called for a daily two-hour ceasefire in Syria so it can deliver emergency aid and help the sick and wounded.
The organisation says the violence is so bad in Homs and other affected areas that locals are unable to go outside to get food, water and medicine.
The Red Cross is negotiating with Syrian authorities and rebels, but it has declined to comment on the progress of those talks.
The Free Syrian Army welcomed the call for a daily truce.
Homs has been under siege for nearly three weeks, with 16 people reported killed on Tuesday.
The opposition Syrian National Council now wants the UN and the Arab League to step in and protect the besieged city.