A mountainous heap of refuse collapsed at Dar es Salam, the largest landfill in Guinea’s capital Conakry, early on Sunday killing at least 30 people, according to a provisional death toll from the country’s civil protection service.Heavy rains, which started at around 3am, washed over the refuse, triggering a landslide that buried nearby shacks.Lancine Sylla, the head of the suburb where the incident happened, said he feared a heavy death toll.Guinea’s minister for territorial administration,...