An influx of immigrants from violent countries is contributing to gang warfare, police have warned.
Scotland Yard said that asylum seekers and other migrants who had witnessed violence in their home countries were having a "disproportionate negative impact" on other youngsters here.
The report is the first official acknowledgment that refugees from war-torn and often lawless countries are at least partly responsible for an upsurge in gang violence.
Police have identified at least 171 gangs operating in London alone.
An influx of young immigrants who have experienced extreme violence abroad may be fuelling gang violence
Criminologists have long argued that youngsters who were forced to act violently to survive in their homeland need help adjusting to a new life in Britain.
But the authorities have shown a reluctance to tackle the issue for fear of stereotyping or appearing racist. However, they already target British-born youngsters at risk of criminal behaviour from birth.
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