A woman walks past, as a police officer escorts his dog as forces evacuate the University College Hospital, partially seen in the background, near Warren Street Underground station, in central London, Thursday July 21, 2005. Warren Street station and two other London Underground stations were evacuated at midday Thursday following reports of smoke and explosions, two weeks after a series of bombings targeted London's public transport system. Police also were investigating a report of an incident on a bus in east London. (AP Photo/Lefteris Pitarakis)