Médecins Sans Frontières is calling for the immediate evacuation of almost two dozen people from the Syrian town of Madaya.
The charity has said five more people have starved to death - since a UN aid convoy gained access on Monday.
MSF has said its medics are treating 18 people - including a 7-month-old girl - who are in dire need of life saving intervention.
A demonstration is being held in Dublin this afternoon in solidarity with the people of Syria.
MSF's Jane Anne McKenna has said it is time people are evacuate.
“This is shocking; patients are still dying despite the arrival of two big international humanitarian convoys,” said Brice de le Vingne, Director of Operations for MSF.
“Some of the current patients may not survive another day. Medical evacuations for the most critically sick and malnourished need to happen immediately, and it is hard to understand why patients clinging on to life have not already been evacuated.
“Nothing should be allowed to hold this up and everything possible should be done by the warring parties and the agencies involved in the convoys to expedite these evacuations as a life-saving humanitarian act.”