Mayor Sadiq Khan is backing a summit on school exclusions which are contributing to violence on the streets of the capital and costing £370,000 each.
Teachers, police, local authorities and community groups and parents meet on Wednesday to find ways to avoid excluding pupils under an ‘inclusion charter’ in the first London Education Summit.
Last year 30 teenagers were killed in the capital while last week two 16 year olds died from stab wounds in Greenwich.
Analysis by City Hall and police task force the Violence Reduction Unit (VRU) has shown that exclusions contribute to the problem of violence among young people.
The VRU - which is hosting the summit - wants more done to ensure that pupils facing exclusion can continue their education and steer them away from criminality.