A teenage boy has died after taking himself to hospital after a knife attack.
Police were called to the scene on London Road in Croydon at 6.40pm on Thursday to reports of a fight amongst a group of people.
When they arrived, no suspects or victims were found, but half an hour later police were called to a south London hospital where the boy had taken himself.
The boy had stab wounds, but despite the best efforts by medical staff, he later died.
A crime scene has been put in place in London road and inquiries are ongoing.
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Homicide detectives have also been informed of the incident.
A Section 60, giving police greater stop and search powers, has been put in place in the areas of Broad Green, Fairfield, Waddon, west Thornton, Bensham Manor, Selhurst and Addiscombe West until 10.30am on Friday.
A Met Police spokesperson said in a statement: "An investigation has begun after a teenage boy was found with fatal stab wounds in Croydon.
"Police were called to London Road, West Croydon, at 6.41pm on Thursday, 18 November to reports of a fight in progress amongst a group of people.
"Officers attended. No suspects or victims were found.
"A crime scene has been put in place.
"At 7.08pm police were then called to a south London hospital after a teenage boy self-presented at hospital with stab wounds. Officers attended.
"Despite the efforts of doctors at the hospital, the boy died a short time later. His next of kin have been informed.
"A post mortem will be carried out in due course.
"Homicide detectives from the Met's Specialist Crime Command have been informed.
"A Section 60 has been put in place in the areas of Broad Green, Fairfield, Waddon, west Thornton, Bensham Manor, Selhurst and Addiscombe West until 10.35am on 19 November.
"Enquiries are ongoing."
Any witnesses, or anyone with any information is being asked to call police on 101, quoting CAD 6179/18Nov, tweet @MetCC or call Crimestoppers on 0800 555 111.
