of an agreement with the syrian government to allow aid into areas where people are trapped, as rob matson reports. >> a ray of hope in the midst of war, over 100 trucks carrying humanitarian aid spreading out towards syria's besieged towns. in madaya, they're bringing medical supplies and a mobile clinic, as well as food. thousands here are trapped by forces supporting penalty assad, which include hezbollah fighters. aid workers say 40 people have died of malnutrition in the town since october. >> we'll have people who are able to not only bring the medical support kits but make assessments for people in need who have often been in extreme and nutritional and food shortage. >> this convoy is headed for towns in the north, around 20,000 people have been cut off by armed rebel groups. heavy gunfire rattles close to damascus. rebels guard the entrance to the city, where trucks line up carrying supplies for at least 30,000 people trapped here. more aid is he is expected in the east, parts of which of held by isil. the convoys are part of an agreement reached last week in munich by over a doze