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An international aid convoy carrying desperately-needed food, medical supplies and blankets has arrived in the Syrian town of Madaya. But why did this town make international news headlines and why did it take so long for aid to be delivered? Our correspondent Rami Ruhayem explains:

(PHOTO: Aid convoys preparing to enter the besieged town of Madaya. AFP / LOUAI BESHARALOUAI BESHARA/AFP/Getty Images)