Police say the teenage suspect in a double stabbing at Kingsbury High School in Brent was a former pupil.
Police believe the attack began when the teenager, a British national, went into a first floor classroom at Kingsbury High School, in Brent, north-west London, and sprayed a substance towards a pupil who was not injured.
Two boys aged 12 and 13 who were seriously injured remain in a stable condition.
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