Six more youths were stabbed in 90 minutes in London last night - with the youngest victim aged just 13.
More than 50 people have been killed in the capital since the start of the year, more than 30 of whom were fatally knifed.
The pressure on murder detectives is now so great that Scotland Yard has enlisted the support of City of London police to help cope with the caseload.
In the latest spate of stabbings, six youths were attacked within a 90-minute period, including a 13-year-old boy who was seriously wounded after being set upon in Newham, east London, shortly before 7pm.
Three youths were arrested on suspicion of grievous bodily harm with intent, Scotland Yard said.
Around an hour earlier, two 15-year-olds were seriously hurt after being stabbed in Grove Road, Mile End, east London.