Detectives are appealing for information following the murder of a teenager in Barking.
Police were called at 01:00hrs on Wednesday, 2 August to Movers Lane - near the junction with Ripple Road - to reports a report of a teenager lying on the ground with stab wounds.
Officers attended and found a 16-year old male injured.
The London Ambulance Service (LAS) attended but he was pronounced dead at the scene.
His next of kin have been informed and formal identification awaits.
A post-mortem examination will be held today, Thursday 3 August.
Two other males -aged 16 and 20 - were also found nearby with stab wounds. The males were taken by LAS to separate hospitals where they were arrested on suspicion murder.
The 16-year-old male has since been discharged and is currently in custody at an east London police station. The 20-year-old man remains in hospital with non-life threatening injuries.
The Homicide and Major Crime Command (HMCC) is investigating.
Detective Inspector Paul Considine of the HMCC said: "We are aware that prior to the fatal stabbing there was a disturbance at a party in the Ripple Centre. I would therefore, like to hear from anyone who was either at the Ripple Centre or in the area of Movers Lane at the time of the attack who may have seen or heard something that could assist with our investigation.
"Whilst two arrests have been made, there are other people who are thought to be involved. It is vital that we discover what happened so that we can be certain of what led to a young man losing his life in such a violent way."
Any witnesses, or anyone with any information, can contact the HMCC incident room number of 0208 345 1570. To give information anonymously call Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.