The suffering in the Syrian town of Madaya is the worst seen in the country's civil war, the United Nations said Tuesday, a day after delivering aid to the town besieged for months. 

"There is no comparison in what we saw in Madaya," the UN refugee agency's chief in Damascus, Sajjad Malik, told journalists in Geneva, when asked to compare the devastation in the town to other areas in Syria.

He said there were "credible reports" of people starving to death during the months-long siege by pro-regime forces.