Police are questioning 19 men after three others were stabbed following a mass brawl in one of the UK's best known tourist spots.
The fight broke out in Trafalgar Square in central London at around 4pm yesterday as shocked tourists looked on.
Police are linking the stabbings and said those involved were believed to be from eastern Europe.
The three injured men were being treated in hospital, police said.
The first victim, aged 19, was found suffering from multiple stab wounds. He is in a stable condition.
A short time later the emergency services found a second victim, aged 18, also suffering from multiple stab wounds. He is in a serious but stable condition.
A third man, aged 19, admitted himself to hospital with stab wounds and was in a serious but stable condition.
A Metropolitan Police spokesman said: "Officers were called to the scene to reports of a large fight and a man being stabbed.
"Police have arrested 19 males in connection with the incidents and they are being held at various central London police stations."