A teenager has been arrested on suspicion of attempted murder after a six-year-old boy was thrown from a 10th floor viewing platform at the Tate Modern art gallery in London. The victim is in a critical condition in hospital after being found on a fifth floor roof, the Metropolitan Police said. The 17-year-old male suspect had remained with members of the public on the 10th floor viewing platform after the incident on Sunday afternoon, the force said. They added that there is nothing to suggest that he is known to the victim. Officers had been called to the gallery at around 2.40pm and the child was treated at the scene before being flown to hospital by London's Air Ambulance.