Witnesses described seeing a boy in school uniform "lying face down on the pavement" outside the station after being attacked.

Police and paramedics scrambled to South Ruislip station after receiving reports of a stabbing at around 4.25pm.

South Ruislip station was closed after police were called to the scene, with no Central line or Chiltern Railway trains stopping at the station.

A police spokesman added: "Officers were called to South Ruislip Underground station at 4.24pm tonight following reports of an assault at the station.

"Paramedics also attended and a young man has been taken to hospital. His injuries are not believed to be life-threatening at this time."

There are also unconfirmed reports that a second teenager suffered stab injuries to his leg.

Speaking to the Standard, local resident Richard Culham said he came out of the newsagent to see a "teenager in a grey tracksuit that had been stabbed in the leg".

He added: "I got some serviettes from the takeaway shop for him, when I went to walk home I saw a crowd gathering under the railway bridge.

"I went over and saw a boy in school uniform lying face down on the pavement. Apparently, he had been stabbed in the side or stomach, all I could see was his body shaking like he was in shock."