NIGERIA'S electoral commission suspended voter registration in most parts of oil-producing Imo state after an election official was shot dead by unknown gunmen, as the country prepares for a series of votes early next year. Armed groups have since last year burned down electoral offices and police stations in states in the southeast, which government blames on the banned separatist Indigenous People of Biafra (IPOB) group. IPOB denies the charges. Independent Electoral Commission of Nigeria spokesman Festus Okoye said in a statement voter registration had been suspended at 54 centres and in three local government areas in Imo state, following…