One of the country's busiest shopping streets has been closed as a man wearing gas canisters stormed into an office and threatened to blow himself up, it was reported. Tottenham Court Road in central London was closed after police received emergency calls at midday. Scotland Yard sent a hostage negotiator to the scene amid reports the man had held people hostage inside the building several floors up. Pictures emerged of computer and office equipment being thrown through one of the office windows. A police spokesman said it was "too early to say if the suspect was armed or indeed had taken any hostages" but businesses and nearby buildings were evacuated. Joaqam Ramus, who works at nearby Cafe Fresco, said before being evacuated: "There was talk of a bomb and somebody having a hostage in a building. "All Tottenham Court Road is closed and so are we - the police told us to shut. "We don't know what it is but it seems someone has a hostage."