A man is fighting for his life after a stabbing on Westminster Bridge, police have said.
Officers were called to the scene at around 10.45am to reports of a fight and found a man with a stab injury. He was taken to hospital in critical condition.
Three people have been arrested on suspicion of attempted murder and another has been arrested on suspicion of affray.
Two of those arrested were taken to hospital with minor facial injuries, the Met Police said.
It is understood the incident is not being treated as terror-related.
The road remains closed as police investigate.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow us on WhatsApp and subscribe to our YouTube channel to keep up with the latest news.