GARBA MUHAMMAD UNIDENTIFIED gunmen killed a student in an overnight attack on a boarding school in north-central Nigeria yesterday, witnesses said, and the regional government said 42 others including some staff and relatives were kidnapped. The assailants stormed the Government Science secondary school in the Kagara district of Niger state at around 2 a.m., overwhelming the school's security detail, according to local residents. One student was killed in the attack, teacher Aliyu Isa and a pupil at the school told local TV news station Channels. Another teacher, who did not want to be named, also told Reuters that one student…