This attracted a lot of attention at the time, the implication being that Evil Whitey was trying to stir up "racism" and "Islamophobia". But here it turns out that the man responsible was a negro. He has just been acquitted of "wasting police time with a false report of a crime" due to procedural faults in the case.
It seems the negro wanted to escape some professional oversight action.
He initially justified his action saying he wanted to draw attention to inadequate security measures in the school. However, there were indications that he wanted to evade an inspection by the National Education authority that was due to have place two days later. Suspended for four months, he may be dismissed for this failing.Source