School stabbing: Boy, 15, critically injured in Dulwich Published duration 20 November 2015

image copyright Google image caption A teenager has been arrested in connection with the attack and is being questioned, Met Police said

A 15-year-old boy remains in a critical condition in hospital after a stabbing at a school in south London.

Another boy, also 15, suffered knife wounds in the attack on the grounds of Kingsdale Foundation School, Dulwich at about 15:30 GMT.

Both are being treated in hospital, according to the London Ambulance Service.

A third teenager has been arrested and is being questioned at a south London police station, the Met said.

image caption The police, ambulance and air ambulance were all called to the scene

image caption The school was rated 'good' at its last Ofsted inspection in 2012

The stabbing took place at the school, where staff were having meetings with deputy head teacher Andrew Sear, on Thursday afternoon.

It is understood the school was not evacuated, however some students were kept inside until the situation was resolved.

An administrator at the school said he was being "flooded with calls" from worried parents.

image caption A sibling of a student at the school said she believed the incident had occurred in the atrium

The 18-year-old sister of one pupil, who did not want to be named, said: "It was in the atrium so a bunch of kids would have seen it.

"[My sister] was in the top of the English department but could hear screaming."

Southwark Council said the school would re-open on Friday and students would be offered counselling.

At its last Ofsted inspection the school, which has 1,600 pupils aged 11-18, was rated as "good" with the behaviour and safety of the pupils considered "outstanding" by the education watchdog.

Following the incident, MP for Dulwich and West Norwood, Helen Hayes, tweeted : "Very distressing to hear of double stabbing of two young people in my constituency this afternoon - thoughts with the injured boys."