A teenage girl and boy have been knifed in a double stabbing in west London.
When they arrived, officers found a 17-year-old girl suffering from stab wounds.
She was rushed to hospital by ambulance and remains there in a stable condition. Her injuries are not thought to be life-threatening, police say.
At the same time, an 18-year-old boy arrived at a central London hospital also suffering from stab wounds. He later discharged himself.
Police have arrested a 19-year-old man on suspicion of GBH with intent and possession of an offensive weapon.
He is currently being quizzed by detectives at a west London police station.
Greenway remained cordoned off by police for several hours on Saturday morning as officers investigated the stabbing.
Anyone with information should call police on 101 or Crimestoppers on 0800 555 111.
