British Home Secretary Jacqui Smith has warned that police could face charges after video footage showed an officer appearing to strike a man who later died.Minutes after seemingly being pushed during the G20 demonstrations in London, newspaper seller Ian Tomlinson died from a heart attack. Smith, whose department covers the Police Service, has welcomed an investigation. “Well, I am glad that the Independent Police Complaints Commission themselves called for further evidence in order to be able to do that investigation as quickly and as thoroughly as possible. And if it identifies, and I can understand people’s concerns, if it identifies the need for a criminal investigation, that then also needs to be pursued,” she said. London’s police chief has also backed an internal inquiry into the death that has seen widespread public outrage. Images show police trying to resuscitate the 47- year-old who collapsed in a nearby road. He was pronounced dead after being taken away by ambulance.