(VOVworld) - Saudi-led air strikes and heavy shelling continued to hit Yemen on Saturday, just 2 hours after a United Nations humanitarian truce took effect. The UN-brokered ceasefire was meant to last until the end of the Muslim’s fast month Ramadan on July 17^th to allow aid deliveries to the country's 21 million people who have endured over three months of bombing and civil war. Air raids pounded Houthi and Yemeni army units in the capital Sanaa and in the embattled southern cities of Taiz and Aden, where residents also reported intense artillery exchanges between the fighters and local militiamen.