This CCTV footage from All Saints Roman Catholic School in Mansfield shows the scene after a teacher, who was suffering from depression, attacked a 14-year-old pupil with a dumbbell.
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Several people, who the police believe to be victims, were found at a house in Derby.
"I’m often asked how I did it. The truthful answer is that I slept very little and my actions were those of a runaway train."
Screen and sporting legends are backing Birmingham's bid to host in 2022.