Victims across London tell us they want the response to fit the crime and for that response to make sure the offender doesn't do it again.
Although it is ultimately up to the police to decide on when to give a caution, victims must have decisions explained to them in order to retain their confidence in the police and other criminal justice agencies.
The police need to be clear on when it is appropriate to give a caution - for example, this is not likely to be right for most violent and sexual offences."
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Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
At least five people have suffered minor injuries but the cause of the blast is still unknown.