DJAFFAR AL KATANTY FAMILIES fleeing a volcano eruption in eastern Democratic Republic of Congo said on Friday they were struggling to find enough food and water as the United Nations called for aid and warned about the risk of cholera. At least 31 people died when Mount Nyiragongo sent a wall of lava spreading towards Goma on Saturday last week, destroying 3,000 homes along the way and cutting a major road used to bring aid to the strife-torn region. The lava stopped just short of the city limits, but thousands more people fled early on Thursday when the government warned…