A teenage boy is fighting for his life after a man reportedly attacked students outside a school, according to police.
Scotland Yard said officers rushed to Dunraven School in Streatham at about 3.30pm on Wednesday.
A 13-year-old boy was treated at the scene for a head injury before being taken to hospital.
Police say his condition has been assessed as life-threatening.
A 35-year-old man has been arrested and taken into custody on suspicion of causing grievous bodily harm.
Later the south London school tweeted: “Stay safe everyone. Stronger together.”
The Met Police said: “Police were called to Leigham Court Road, SW16, at 15.23hrs on Wednesday, 25 November, to reports of a man attacking people with a pole.
“Officers attended along with paramedics from London Ambulance Service (LAS).
“A 13-year-old boy was found with a head injury.
“He was treated at the scene before being taken to hospital. His condition has been assessed as life-threatening.
“A 35-year-old man has been arrested on suspicion of causing GBH. He has been taken into custody.”