Under a Freedom of Information request made to West Mercia Police, figures show that there was a 120 per cent rise in the number of knife incidents in primary and secondary schools across West Mercia.
The knives included lock knives and Stanley knives as well as everyday knives.
In 2011 there were four reported incidents. The offenders were aged between 11 and 17 and received cautions and reprimands from the authorities.