The conduct of two men jailed for life over the murder of a rival gang member "reads like something from a film", Metropolitan Police DCI Noel McHugh said following the sentencing.
He added: "[Jamie] Marsh-Smith and [Samuel] Zerei were professional and dangerous criminals. Marsh-Smith even tried to execute his getaway driver Samuel Zerei when he failed to dispose of the getaway car used in the murder of Zafer Eren."
"Our investigation continues into Zafer Eren's murder as we seek to find those responsible for ordering the killing. The convictions today demonstrate that the police will not go away."
"Police are offering a reward of up to £30,000 for information leading to the arrest and conviction of those responsible for Zafer Eren's murder."
More top news
£13 million pounds is being invested to help stop vulnerable young people being exploited by gangs who use them to sell drugs.
A drunk man who narrowly escaped death when he lay down between train tracks in Harlow has been given a 12-month community order.
A man from north London has been charged with the manslaughter of Louella Eve Fletcher-Michie, who died at the Bestival music festival.