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2 July 2010, 15:26 | Updated: 2 July 2010, 15:31
The headteacher of a school where a 15 year old boy was stabbed to death says they are all in shock.
It happened this morning at Park Campus school in West Norwood in south London.
The boy later died in hospital.
Another teenager suffered minor injuries to his arm.
Four people have been arrested.