Motorbikes have been banned at night in Maiduguri in a bid to stop the attacks A gunman believed to be from the Boko Haram Muslim sect has shot dead a prominent cleric from a rival sect in northern Nigeria. Ibrahim Birkuti has criticised Boko Haram for killing dozens of security agents and politicians in recent months near the city of Maiduguri. Like most of the other victims, he was shot dead by