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Bomb disposal experts were called out to almost 600 schools in the wake of government advice about a potentially hazardous chemical.
The warning about stocks of 2,4 dinitrophenylhydrazine (DNPH) sparked a flurry of calls to the Army, which carried out hundreds of explosions.
The controlled explosions were carried out between 21 October and 21 December 2016 after schools were advised to check the chemical by the government advisory science service CLEAPSS (Consortium of Local Education Authorities for the Provision of Science Services).
The Ministry of Defence (MoD) figures were acquired by the BBC following a Freedom of Information request.