A 16-year-old boy has been stabbed outside a college in south London.
Police and paramedics descended on the area after the teenager was knifed outside Croydon College on Tuesday afternoon.
A “quick thinking” member of staff administered first aid to the victim until emergency services arrived at the scene, officials at the college said.
The boy was stabbed in the street just outside the education centre at about 12.25pm.
He was treated at the scene by medics from London’s Air Ambulance before being rushed to a major trauma centre.
A spokesman for the college, which has more than 8,000 students on its books, said: “The incident took place outside the college.
"A quick-thinking and well-trained member of college support staff administered first aid, while others contacted the police and the ambulance service.”
Scotland Yard said the victim’s condition was not yet known.
Witnesses described seeing a swarm of emergency vehicles in the area.
Artist Catherine Stephenson, 44, who lives locally, told the Standard: “I saw the Air Ambulance landing on the college green, the open space just outside the college.
“We watched it come into land and then we saw the medics heading inside.”
Matt Woosie posted on Twitter: “Looks like something serious has happened at/near Croydon college - police have taped off part of college road.”
Another person named Josh tweeted: “An air ambulance just flew past my building and landed by Croydon College! What's going on.”
Winston Smith wrote on Facebook: “There has been stabbing outside Croydon College.”
A Met Police spokesman said: “Police were called by the London Ambulance Service (LAS) to College Road, Croydon on Tuesday, 14 March at around 12.25pm to a report of a stabbing.
“Officers attended along with the LAS and London's Air Ambulance Service and found a 16-year-old male suffering from a stab injury.
“Emergency services remain on scene.”
A London Ambulance spokeswoman said: “We sent an ambulance crew, a paramedic in a car, an emergency responder in a car and an incident response officer to the scene. We also dispatched London’s Air Ambulance.
“The first paramedic arrived at the scene in seven minutes.
“We treated a teenager at the scene and took him as a priority to a major trauma centre.”
The boy's injuries are not believed to be life threatening, police said.