Kelyan Bokassa found injured onboard a 472 bus in Woolwich Church Street just before 2.30pm on January 7.
Officers and London Ambulance Service crews attended, however, the 14-year-old was pronounced dead shortly after.
Detectives continue to “follow a number of lines of enquiry” and would now like to speak to 15-year old Colin Chabikwa and 16-year-old Mosawar Zazi in connection with Kelyan’s murder.
(Image: Metropolitan Police)
Chief Inspector Sarah Lee has urged the public not to approach them but to contact police “as soon as possible”.
She added: “Firstly, my thoughts are with the family and friends of Kelyan.
“I know his death has deeply affected many in the community and I would like to thank people in Woolwich for the support they have shown.
“Officers have been undertaking increased weapons searches, reassurance patrols and house-to-house enquiries. I know these can be disruptive, however it has been vital, and your patience is appreciated.
“Our team of detectives is working around the clock to identify those responsible for Kelyan’s murder and appeal for your help to locate Chabikwa and Zazi.
“I would urge anybody with information about their whereabouts to contact us immediately by calling 999.
“If seen, we urge the public not to approach them, but to contact police as soon as possible.”
Anyone with information that could assist the investigation is asked to call 101, quoting the reference 3795/07Jan. Report immediate sightings by calling 999. The investigation team can also be contacted directly on 0208 721 4101.
You can also contact the independent charity Crimestoppers anonymously on 0800 555 111.