Detectives investigating the death of a 14-year-old schoolboy have released CCTV images of people they believe have "crucial information".
David Idowu suffered several stab wounds when he was attacked in Great Dover Street in Borough, south London, on 19 June this year.
Officers have released CCTV images from the Tabbard Street area taken shortly after the incident.
A 16-year-old boy has been charged with David's murder.
One image shows a group of youths walking through an estate shortly after the incident.
It is believed they witnessed David being stabbed and followed him after he ran away from his attacker.
The other image is of two youths, one of whom is seen riding a BMX bike.
"I understand that there are a lot of young people who have information, but are scared of coming forward and talking to us," said Det Ch Insp Damien Allain.
"I can assure them that any information will be treated in confidence and that there are measures that can be taken to protect them at court."
David was the 19th teenager to have died in violent circumstances in London in 2008.
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