A child remains in critically injured after a 'drive-by' shooting saw three other adults rushed to hospital.
Kingsland High Street, in Dalston, remains cordoned off after shots were fired near a restaurant on Wednesday (May 29) night.
Emergency services were called at about 9.20pm.
Three adults and a child were found with gunshot injuries at the scene and taken to an east London hospital.
The child remains in a serious condition.
The Met is awaiting further details of the other victims' condition.
Eye witnesses reported "horrific scenes" with many saying they saw a speeding motorcyclist.
"It was carnage to be honest," said one person. " It’s an outrage when innocent people are subject to this and another example of innocent children being caught in crossfire."
A large section of Kingsland High Street remains closed.
A detour in operation for buses 67, 76, 149, 236, 243 and 488.
A London Ambulance Service spokesperson said: “We were called at 9.21pm on Wednesday 29 May to reports of a shooting on Kingsland High Street, Hackney.
“We sent resources to the scene, including ambulance crews, advanced paramedics, incident response officers and members of our tactical response unit.
"We also dispatched a trauma team from London Air Ambulance, which consisted of a doctor and a paramedic in a car.
“We treated three adults and one child at the scene before taking them all to a major trauma centre.”
Deputy Assistant Commissioner Matt Ward, said on Wednesday: "We know Londoners will be shocked by what has taken place tonight.
"Our thoughts go to all those affected.
"Fast moving enquiries are under way and we will update as soon as we can. If anyone has any information, please contact us."
Anyone with information is asked to call police on 101 or contact @MetCC on X, referencing CAD 8082/29May. To remain anonymous call Crimestoppers on 0800 555 111.
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