A 16-year-old has denied murdering an Afghan refugee in a knife attack outside a college in London. The boy, who cannot be named for legal reasons, is accused of attacking Hazrat Wali close to a railway footbridge in October last year. Wali, 18, a student at Richmond upon Thames College in Twickenham, west London, died from his injuries on a nearby playing field. The victim left Afghanistan with his twin brother at the age of 12. His brother returned to Afghanistan but he was reportedly living with a foster family in London. He was studying construction with the intention of returning to Afghanistan to help rebuild the country, his family said. The 16-year-old appeared from detention at London’s central criminal court via video link from detention on Tuesday. A trial date has not yet been set.