Students and families were reunited in emotional scenes after the shooting at Arapahoe high school in Colorado.
A 15-year-old girl was in critical condition after the shooting, suspected to have been carried out by an 18-year-old, Karl Pierson, who police say apparently shot himself at the scene.
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Ian Paterson was convicted of 17 counts of wounding with intent and three counts of unlawful wounding.
The child suffered months of headaches that left doctors baffled. He was finally diagnosed after he drew an Etch-A-Sketch of his condition.
A guarantee from City Hall to bankroll the annual £2-3m bill was a key planning condition imposed by Westminster and Lambeth councils.