A man has been rushed to hospital with life-changing injuries following a stabbing at a park near Waterloo station.
Officers were called to Waterloo Millennium Green just before 8pm on Wednesday following reports of a stabbing.
Upon arrival at the scene, officers found a 25-year-old man being treated by the London Ambulance Service for a serious head injury.
A police cordon has been put in place and enquiries remain ongoing.
The victim is said to be in a life-changing condition.
No arrests have been made.
A spokesperson for Met Police said: “Police were called at 19:40hrs on Wednesday, 8 October to reports of a stabbing on Waterloo Millenium Green, SE1.
“Officers attended, and a man, aged 25, was being treated by the London Ambulance Service. He was taken to hospital and his condition is believed to be life-changing.
“A crime scene was put in place and enquiries are ongoing.
“There have been no arrests at this stage.
“Anyone with information is asked to contact police on 101, or online, quoting CAD 7429/08OCT. Alternatively, you can contact Crimestoppers on 0800 555 111.”
A London Ambulance Service spokesperson said: “We were called at 7.46pm on Wednesday 8 October to reports of a stabbing on Baylis Road, SE1.
“We sent an ambulance crew and a clinical team manager to the scene.
“Our first paramedic arrived in less than four minutes.
“We treated a man for a head injury and took him to hospital as a priority.”
