Witnesses described how armed police swooped on a road in west London where they found a man had been fatally injured.
The officers, supported by a force helicopter, were scrambled to Birbeck Road, Acton, in the early hours of Sunday.
Two others were injured in the incident, police said.
A mother of four, 58, who lives close to the crime scene told Metro: ‘The bloke who was attacked on the High Road then staggered into Birkbeck Road where he died.
‘The incident stated outside some shops. Police people locally it was a shooting and that two others were injured.
‘It’s extremely shocking. There were police, some armed everywhere and a police helicopter.’
Another neighbour said: ‘I woke up to police blue lights and shouting. Paramedics seemed to be working on a man. It was horrible.
A police spokesperson added on road closures as the investigation unfolds: ‘While we recognise the impact this will have on local residents and businesses, it is essential to provide us with the best chance to secure evidence.’
A huge police cordon remains in place as forensics officers and detectives trawl for clues.
Latest London news
There was major upheaval for Monday morning commuters as road diversions remained in place.
A London Ambulance Service spokesperson said: “We were called at 4.06am to reports of an incident on Birkbeck Road.
‘We sent a number of resources to the scene, including ambulance crews, a paramedic in a fast response car and an incident response officer. We also dispatched London’s Air Ambulance.
‘Sadly, despite the best efforts of our crews, one person died at the scene. Two patients were taken as priorities to major trauma centres.’
Got a story? Get in touch with our news team by emailing us at webnews@metro.co.uk. Or you can submit your videos and pictures here.
For more stories like this, check our news page.
Follow Metro.co.uk on Twitter and Facebook for the latest news updates. You can now also get Metro.co.uk articles sent straight to your device. Sign up for our daily push alerts here.
Discover more from USNewsRank
Subscribe to get the latest posts sent to your email.