Twenty people, many of them women and children, were trampled to death on Monday in a stampede for food and money for refugees in southeast Niger, reports said. “We have a provisional toll of 20 dead,” a medical source said. Aid workers confirmed the account and said about 10 people had been injured. The accident occurred at a youth and culture centre in Diffa, the main town of a region that abuts Nigeria and Chad. The region has been repeatedly hit by attacks by Nigeria’s Boko Haram jihadist group since 2015. It hosts...