Otas Sarkus was killed in August (Credit: Metropolitan Police)
Otas Sarkus was shot twice in the head in Raymond Road, near Upton Park station, on Wednesday, 18 August.
He was rushed to hospital where he was pronounced dead two days later.
A second man, aged 18, was also found injured on a Route 238 bus in Plashet Grove. He was taken to hospital where his condition was assessed as not life-threatening.
Officers have arrested three men, aged 28, 29 and 31-years-old, on suspicion of murder and attempted murder today. They all remain in police custody.
It is after the independent charity Crimestoppers offered a £10,000 reward for information about the incident earlier today.
Anyone with information is asked to contact police on 101 or tweet @MetCC quoting Operation Tielen or CAD 7763/18Aug.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
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