A knifeman who slashed a stranger across the face on a rush-hour Tube train for accidentally brushing against him is facing jail.

Ahmed Bero, 23, launched himself at teenager Kurrim Buchanan in front of dozens of terrified commuters on the Bakerloo line between Paddington and Marylebone stations.

Bero drew a craft knife from his pocket and sliced through Mr Buchanan’s clothes before cutting him across the cheek as the minor scuffle turned bloody at about 8.25am on October 18 last year, Blackfriars Crown Court heard.

Mr Buchanan suffered a three-inch cut to his face, while his friend Boyd Maynard was also injured in the fracas, which spilled out onto a platform at Paddington packed with commuters.

Jurors were shown CCTV from the platform, where Mr Buchanan and Mr Maynard made their escape, barging past rush-hour commuters and finding safety in the arms of a police officer.

Glen Carasco, prosecuting, had told the court: “Mr Buchanan and his friend Boyd Maynard got on together at around 8ish and managed to get seats.

“They sat down opposite each other, one of them sitting next to the defendant Mr Bero.

“The Tube carried on heading southbound and as you would expect gets busier and more cramped. During the journey it seems that Mr Bero and Mr Buchanan come into some sort of contact accidentally whilst they are sitting next to each other.”

Witnesses saw the trio arguing before Bero unleashed his attack, pulling out a yellow craft knife as the train pulled in to Paddington.

Mr Maynard told the court he had tried to calm Mr Buchanan because he had blood gushing from his face, adding: “When I saw him on the platform I saw that his injury was 100 times worse than mine. He was saying, ‘My face is f*****’. I was trying to calm him down.”

Bero, who stayed on the train through Edgware Road until police stopped it at Marylebone, claimed self-defence after the two men tried to rob him, saying Mr Buchanan had pulled out the knife.

But Bero, of St Mary’s Street, Gillingham, Kent, was unanimously convicted of wounding with intent to cause GBH, and possessing a knife in public.

Judge Daniel Worsley bailed Bero on Monday, but warned him he faces “potentially a long sentence” when he returns on December 3.

He added: “For somebody who takes a knife unlawfully and uses it, custody is very much almost inevitable.”