The fugitive leader of a prominent Biafra secessionist group has been arrested and extradited to Nigeria, in a move likely to inflame separatist unrest in south-east Nigeria. Nnamdi Kanu had been wanted by Nigerian authorities since 2015, when he was charged with terrorism offences and incitement, after broadcasts aired on Radio Biafra, a digital station he founded and ran from his home in Peckham (UK).