Police have cordoned off a busy road in south east London after a double stabbing in broad daylight.
Officers scrambled to Crofton Road, Orpington, just after 12.30pm on Wednesday after two males were found with knife wounds.
The pair were taken to a major trauma centre but their condition and age is not yet known, Scotland Yard said.
London Ambulance Service attended the scene and called for police assistance.
One man claiming to be a witness tweeted: "Witnessed two young boys running across the road asking for help. Both were stabbed. Stopped to help.
"The gravity of the incident meant London Air Ambulance had to be called."
A crime scene is in place and no arrests have been made.
A London Ambulance Service spokeswoman said: "We sent two ambulance crews, an incident response officer and we also dispatched London's Air Ambulance trauma team.
"We treated two people at the scene, both men, and took them to a major trauma centre."
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