DJAFFAR AL KATANTY MORE than 20,000 people are homeless and 40 still missing in the aftermath of a volcanic eruption in eastern Congo that killed dozens and continues to cause strong earthquakes in the nearby city of Goma, the United Nations has said. Saturday's eruption sent rivers of lava streaming down the hillside from Mount Nyiragongo, destroying hundreds of homes and forcing thousands to flee, but stopped 300 metres short of Goma airport, the main hub for aid operations in the east of Congo. The ash cloud caused by the eruption has closed down airports in Goma and Bukavu, and…