title: UK police making urgent inquiries to find who was behind metro incident
text: LONDON (Reuters) - London police said on Friday they were making urgent inquiries to track down who was responsible for an explosion at a metro station, which officers are treating as a  terrorist incident.    Counter Terrorism detectives are making fast-time inquiries to establish who was responsible for the incident at Parsons Green tube station,  London s Metropolitan police tweeted on Friday.  