Two girls, aged 16 and 17, have been stabbed in Lambeth.
The incident happened at about 16:41hrs on Sunday, 25 April.
Police and London Ambulance Service arrived at Norwood Road, SE27 and met two girls with stab wounds.
The police said the 16-year-old girl’s condition is critical but stable. The 17-year-old received treatment, and hers do not appear to be life-threatening.
The families have been informed.
Police said the two girls are known to each other.
A crime scene remains in place as officers patrol the area.
Investigators said four boys between the age of 16 and 17 had been arrested on suspicion of attempted murder.
They all remain in police custody at the time of this report.
Detective Sergeant Rob Merrett from the Central South Command Unit described the incident as “shocking.”
“This is a shocking incident involving two young female victims, one of whom remains seriously ill in hospital. It has understandably caused considerable alarm in the community.
“Officers responded immediately when the 999 call was received. Two boys were quickly apprehended near the scene, and urgent enquiries led to two other males being arrested later on at addresses in Lambeth.
“All four are now in custody, and my team are conducting a thorough investigation to establish what has led to this unacceptable violence.”
Detectives urged Anyone who may have witnessed the incident, has pictures or videos that could assist the investigation to contact the police.
” It is imperative that we work with the community to fully establish what has happened here and bring any offenders to justice.”
Detective Sergeant Rob Merrett said, “Anyone with information is asked to call police via 101 quoting reference Cad 4970/25Apr. To remain anonymous, contact Crimestoppers on 0800 555 111.”