A teenage thug brazenly walked into Croydon's youth court to announce he had just stabbed a gang rival who was due to appear before the bench.

The shocking confession came minutes after his 16-year-old adversary was stabbed under the arm while walking through the Fairfield Halls car park at around 10.15am on Wednesday.

The attacker left his victim, who it is thought was due to appear on gang related charges, with a punctured lung before running towards the courts in Barclay Road.

He then sauntered into the building and told startled staff and the boy's mother he had just knifed the teenager. He then ran out of the building, jumped on a bicycle and rode off up the road before turning into nearby Alytre Road.

It is thought CCTV cameras in the magistrates court complex filmed him walking into the building. The tapes have been passed to police.

The victim was taken to Mayday Hospital for treatment.