AT least 78 people were killed in a stampede in the Yemeni capital Sanaa as residents gathered at a school to receive cash donations distributed by merchants during Ramadan, witnesses and the Houthi administration said. Hundreds of people crowded to receive the alms, which amounted to 5,000 Yemeni riyals, or about $9 per person, two witnesses involved in the rescue effort told Reuters. "When the door opened, there was a big rush by people wanting to reach the schoolyard first and some people began falling on the steps leading to the entrance," one medic said. Two-thirds of the population needs…