GUNMEN in north central Nigeria have killed eight people, including a divisional police chief, in the latest violence ahead of a presidential and parliamentary election later this month, police and a security source said. Insecurity is a big issue for voters in a country where armed gangs terrorise people in villages and on highways and carry out kidnappings for ransom. Police in Benue state responded to a distress call after gunmen blocked the Markudi-Naka road, forcing travellers to flee, Benue state police spokesperson Anene Sewuese Catherine said. The divisional police officer for Naka town, Mahmud Abubakar, led a team of…