Four people, including a pensioner, have been taken to hospital after shots were fired from a vehicle in south London.
The victims all suffered gunshot wounds following the "indiscriminate" shooting in Brixton early on Saturday.
A 25-year-old man is in a life-threatening condition, while three others, aged 21, 47, and 70, had non-life-threatening injuries.
The Metropolitan Police were called at 1.14am after reports of a firearm being discharged on Coldharbour Lane.
Specialist crime officers were at the scene within four minutes of the call, the force said.
The London Ambulance Service said: "We treated four patients at the scene.
"We took two of them to a major trauma centre and the other two patients to a local hospital."
No arrests have been made but officers are working to identify those responsible, the Met said.
Several police officers could be seen searching an area of grass outside the Southwyck House estate on Coldharbour Lane.
Estate resident Robert, 40, who did not want to give his surname, said he believed the incident happened during a "packed" barbecue party.
Detective Chief Inspector Allam Bhangoo, who is leading the investigation, called the shooting an "act of indiscriminate violence".
DCI Bhangoo added: "We understand how concerning this incident will be for the local community and want to reassure residents that officers are working at pace to identify those responsible."
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There will be an increased police presence in the area over the coming days.
The Met is appealing for anyone who witnessed the incident or has footage to contact them.
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