BBC News
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If you were faced with someone who'd just been stabbed, would you know how to help?
Teenagers from the age of 14 in some areas of the UK will get training on how to help stab victims, in a new scheme launched by St John Ambulance.
The Young Responders initiative aims to give young people "lifesaving first aid skills" over the next two years.
St John Ambulance says street violence is a "major concern" at the moment.
Training will be given in London, Leeds and Manchester.
A more 'instinctive' response
"We know that in the moment of handling an incident, adrenaline can take over," St John Ambulance says, in a statement.