It is proved to be a stop-start operation that has had to evade mortar shelling, and reach agreements with both the military and rebel fighters.<br /> <br />But aid supplies are again being taken into the beseiged Syrian city of Homs and civilians are being allowed to come out.<br /> <br />About 3000 people have been trapped there for more than a year, living in desperate conditions.<br /> <br />Al Jazeera's Gerald Tan reports.
