Man critical after being stabbed
A man is in critical condition after being stabbed on Westminster Bridge in central London, the Metropolitan Police said.
Emergency services received reports of a fight on the bridge at around 10:45 GMT.
The London Ambulance Service and air ambulance also attended and took him to hospital.
The Met said three people were arrested on suspicion of attempted murder and another for affray.
Two of those arrested were taken to hospital with minor facial injuries, the Met added.
It is understood that the incident is not considered to be terror-related.
Westminster Bridge and surrounding roads have been closed while police investigate.
Bus lines 11, 12, 148, 159, 453 and other buses have been diverted.
