Three people have been arrested after a 14-year-old boy was stabbed to death on a double-decker bus in south-east London.
Kellyanne Bokassa was pronounced dead shortly after the attack in Woolwich on January 7.
On Wednesday, two boys, aged 15 and 16, were arrested on suspicion of murder, and a 44-year-old woman was arrested on suspicion of assisting an offender.
The three are still in custody, the Met Police said.
DETCH Insp Sarah Lee, who led the investigation, said the arrests marked a “significant step”.
“We continue to appeal to anyone with information about Kellan’s murder to come forward and speak to us,” he added.
Police were called to reports of a knife attack on a bus in Woolwich on 7 January at 14:28 GMT.
The incident happened on a route 472 bus on Woolwich Church Street near the junction with the A205 South Circular Road.
Det Ch Insp Lee said: “I would like to thank the officers for working around the clock to find our suspects and commend the Woolwich community for their continued support and patience whilst We have done our investigation.
“I know this incident has affected you all deeply.
“We are doing everything we can to tackle violent criminals across London.”