A boy is in a critical condition in hospital after four people were stabbed in south London.
The victims, aged between 15 and 16 years old, were attacked outside Landor House in Camberwell on Thursday evening, police said.
One remains critical, another is in a serious but stable condition and the other two were not seriously injured.
Six boys, aged between 15 and 16, have been arrested on suspicion of violent disorder and grievous bodily harm.
The four victims were all taken to hospitals in south London for treatment.
A Section 60, granting police stop and search powers across the area, has been authorised until 09:30 on Friday.
Supt Annmarie Cowley said the Met police’s investigation was “in its very early stages and at present we cannot speculate on what the nature of it may be”.
She described the attack as “beyond comprehension” and said the order had been granted “to deter any further potential trouble”.
The arrested teenagers remain in police custody.