The conflict in Yemen has triggered a deepening displacement crisis, with the UN estimating that more than 320,000 people have been forced from their homes since August, nearly half of them children. UNICEF and the Yemeni Education Ministry estimate that 3.2 million children are currently out of class because of war or poverty, a figure that could rise dramatically if the fighting does not stop soon. Al Jazeera's Malik Traina reports.