Two men have been taken to hospital with suspected stab wounds after a gang fight broke out in The Mall, near Ealing Broadway.
Police said they were called shortly before 3.15pm today to reports of youths fighting. The London Ambulance Service was subsequently called in which both men were taken to a central London hospital.
One of the males was pronounced dead at the hospital, while the other is believed to have injuries that are not life-threatening. No arrests have been made yet.
Any witnesses or anyone with any information should call police on 101 or Crimestoppers anonymously on 0800 555 111.