Coimbatore, May 02 (ANI): Police beefed up security at railway stations across India after two bomb blasts in Bangalore- Guwahti train in Chennai which killed one woman and left nine others injured. Paramilitary forces and dog squads were deployed at several stations, with the police scanning through belongings of almost all the passengers in Coimbatore city in Tamil Nadu. Police in the northern part of the country also issued an alert and railway stations were scrutinised. A team from the National Investigation Agency has joined the investigation in Chennai.