A man in his 20s was stabbed to death in the street in south-east London today, police said.

The victim was pronounced dead at the scene yards from a primary school in Thamesmead after he was stabbed just after 2pm.

A witness, who did not want to be named, told the News Shopper that the man "crawled for help" after being stabbed in the chest.

The bystander said: "I heard a lot of shouting and commotion on Wolvercote Road. This turned out to be a fight with four youths.

Lots of Police vehicles#stabbing Wolvercote Road Thamesmead# pic.twitter.com/LbPvUwAale — Brian Barnett (@cyclespeedwayBB) October 14, 2014

"I then saw two youths run off holding a large knife. The man they had just stabbed in the chest crawled for help."

Paramedics from the London Ambulance attended the scene but were unable to save the man. An air ambulance landed on the playing field of nearby Willow Bank Primary School.

A police spokeswoman said: "We were called to a large group congregated in Wolvercote Road.

"We found a man in his 20s suffering a stab wound. He was pronounced dead at the scene."

The Met confirmed there have been no arrests.