At least 21 people have died after a passenger boat sank in River Nile state in northern Sudan, a medical group has told the BBC. The boat was travelling between the villages of Tayba al-Khawad and Deim al-Qarai, carrying nearly 30 passengers, including women, elderly people and children, the Sudan Doctors Network said. "Rescue teams are continuing with their work since there could be more bodies," said Dr Mohamed Faisal Hassan, the network's spokesperson. Authorities in River Nile state said