From the BBC
http://news.bbc.co.uk/2/hi/africa/6477177.stm
Nigeria teacher dies ‘over Koran’
Secondary school pupils in north-eastern Nigeria have killed a teacher after apparently accusing her of desecrating the Koran, police say.The teacher, a Christian, was attacked after supervising an exam in Gombe city. It is not clear what she had done to anger the students.
The authorities, concerned that communal unrest [...]