A photo of the victim of a stabbing at East Croydon train station has been released.
Louis Johnson, 16, was stabbed to death in a 40-second attack on Monday afternoon.
A 16-year-old boy has been arrested in connection with the teenager’s murder but police have not released details on his alleged involvement.
British Transport Police (BTP) say Mr Johnson arrived at East Croydon station at about 4.30pm, went through the ticket barrier and was attacked minutes later.
He was on an overbridge at the station when he met someone who immediately pulled out a knife and stabbed him, BTP said.
Detective Chief Inspector Sam Blackburn said: “This was a senseless killing at an extremely busy time of the day, and my thoughts are with Louis’s family at this painfully difficult time.”