With suspected terrorist groups triggering bombs in Hyderabad city killing about 11 persons on Thursday, the police sounded alert in Krishna District. The police launched searches at all public places in Vijayawada, Machilipatnam, Nuzvid, Gudivada and other towns. Security was beefed up at the temples, government offices and other security zones in the district. Sniffer dog squads were pressed into service at bus and railway stations and other public places. Instructions were given to launch ‘naka bandi’ , said City Police Commissioner N. Madhushdhan Reddy.