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Problems with new technology on Saturday forced voting to be extended in presidential elections in Africa's most populous nation, Nigeria, as renewed Boko Haram violence hit the knife-edge polls. The Islamist militants were suspected of killing at least seven people in separate attacks in northeastern Gombe state, including at polling stations, while on Friday, 23 people were beheaded in Borno state. President Goodluck Jonathan was the most high-profile victim of the glitches with handheld readers, which scan biometric identity cards to authenticate voters to help cut electoral fraud. His main opponent, former military ruler Muhammadu Buhari, had no such problems and was accredited without a hitch in his hometown of Daura, in northern Katsina state.