inputs: hypothesis: Police report there has been an explosion in the tube station. premise: Armed police were deployed at UCL Hospital, near Warren Street tube station, after reports of a suspect entering the hospital. There was speculation that one of the bombers may have been injured and sought treatment at the hospital. A Scotland Yard spokesman had said "We are dealing with an incident at University College Hospital and we have armed officers deployed there. We cannot go in any further detail at this stage." A UCL spokeswoman confirmed that an email had been sent to staff asking them to be on the lookout for the suspect. At 16:00 a spokesman for the Metropolitan police confirmed that the incident was over, but armed police returned to the hospital 30 minutes later to search the premises. Police have now also confirmed this is unrelated to the explosions.