A 15-year-old girl was killed and about 30 people were wounded during clashes between protesters and security forces in Senegal's capital Dakar on Tuesday night, a local official said. Protests broke out in the crowded Ngor neighbourhood amid a dispute over a piece of land that locals want to use to build a school but which the authorities have earmarked for a police station. They came during a time of general unrest in Senegal, which is considered one of West Africa's most stable democracies but has been rocked by violent demonstrations linked to President Macky Sall's refusal to rule out…