Three men have been stabbed and a woman was reportedly pushed from a balcony as a fight broke out in central London.
Police rushed to a building in Empire Square East, a short distance from Borough Tube station, at 10.12am on Sunday.
Photos show several police cars at the scene.
The Met Police said a woman "was found with injuries reportedly sustained from a fall from height".
A spokesman added: “She was treated at the scene by paramedics from London Ambulance Service before being taken to hospital."
Three men were also found near the scene with stab injuries.
“One male was found near to the scene with a stab injury," the spokesman said. "He was treated by paramedics before being taken to hospital.
“Two other males, who also had stab injuries, were detained near to the scene on suspicion of GBH. They have been taken to hospital.
“A woman was also taken to hospital to be treated for shock.”
None of the injuries are believed to be life-threatening.
