Thousands of people have fled their homes in northern Nigeria after riots prompted by the election of incumbent President Goodluck Jonathan. The Red Cross told the BBC some 16,000 has been displaced in six states across the north where some residents slept in police stations for safety. Jonathan appealed for an end to the violence and imposed a curfew. His main rival, Gen Muhammadu Buhari, a northerner, told the BBC the violence was sad, unwarranted and criminal. Some of the rioters have been alleging ballot-rigging, but the former military leader said he wanted to disassociate himself and his party from the clashes.