Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. “When something like this happens we go into lockdown and make sure the children are safe and that’s what happened on this occasion.” A top London school reportedly went into lockdown on Monday after a man collapsed at the entrance following a knife attack.Police responded to reports of a stabbing in Lennox Gardens in southwest London around 4pm.The man in his 20s was understood to have been attacked by two males on a moped before seeking help at the nearby Knightsbridge School. Teachers helped the man, who was reportedly stabbed in the leg, until paramedics arrived and he was taken to hospital, it was reported. A spokesperson for the Metropolitan Police said: “The man – believed aged in his 20s – was taken to a central London hospital; at this early stage it is not thought his condition is life threatening.”The victim was approached by two males on a moped before being attacked. The moped then drove away from the scene. One line of enquiry is that this was an attempted robbery.”Police say inquiries are continuing.Magoo Giles, principal of Knightsbridge School, told MailOnline that teachers found the man in the school’s doorway bleeding heavily. “The victim sought refuge in our doorway. That’s when we became aware something had happened and he was then supported by my teachers and staff until the ambulance arrived.