A man was stabbed in front of shocked families at a playground while pushing two children on the swings, bystanders say.
The man was knifed at Nelson Square in Southwark at around 1.20pm on Sunday.
According to one bystander, the man was pushing two youngsters on swings in the playground when a pair of youths attacked him.
He managed to stagger to The Cut where he was given first aid outside a pub.
Following the incident, the area was cordoned off by police as the attack was investigated.
Video footage shot by Neil Evans, who was passing through the area, shows an air ambulance taking off from the scene.
Scotland Yard confirmed police, paramedics and London’s Air Ambulance were called to The Cut following reports of an assault.
A spokesman for the Met Police said: “A man, believed to be aged in his mid-20s, was found suffering from a stab injury.
“He was taken to a south London hospital where he remains in a stable condition.
“His injuries are not believed to life-threatening.
“At this early stage of the investigation, it is believed that the man was assaulted in Nelson Square.”
There have been no arrests so far.