Nigeria's first census in 15 years is under increasing attack from separatist groups who have attacked officials in the south of the country with acid and machetes in order to disrupt the headcount. Members of the Movement for the Actualisation of a Sovereign State of Biafra (MASSOB) attacked at least seven officials in the market town of Onitsha in Anambra state on Wednesday, the second day of the census in Africa's most populous country. Uzor A Uzor, of the human rights group the Civil Liberties Organisation, said: "I counted at least seven enumerators who came to report at the police station yesterday that they were attacked with acid."One of the victims, Felicia Nwachukwu, said three MASSOB members on a motorbike sprayed acid on her back and attacked a colleague with machetes before speeding off. "We were numbering houses when they came and poured acid on me and slashed my colleague's hand," she said.