The case increased the level of concern expressed about levels of violence involving school-age youths , and the safety of pupils and staff while in school , which were beginning to become public issues in the United Kingdom in the early 1990s . This followed the fatal stabbing of 12-year-old Nikki Conroy by a mentally ill intruder at her Middlesbrough school in March 1994 . In March 1996 , 16 young children and their teacher were shot dead by intruder Thomas Hamilton at their school in Dunblane , Scotland . In July 1996 , nursery nurse Lisa Potts and several toddlers were wounded by machete-welding intruder Horrett Campbell at a nursery school in Wolverhampton . These incidents all contributed to major improvements in security at schools across Britain , particularly in areas with high crime rates
were wounded
Wolverhampton machete attack
Murder of Philip Lawrence