Investigating agencies are suspecting involvement of terror outfits in the blast that took place inside a house in Khagragarh in the district, killing two suspected militants and injuring another.
The high alert was sounded following a high-level meeting at the state secretariat here in which Director General of Police G.M.P. Reddy and Special Inspector General (CID) Damayanti Sen were present.
"All police stations in the state have been asked to maintain a strict vigil against any subversive activity or attempt at sabotage," Reddy told media persons after the meeting.
The Eastern Railway (ER) too has stepped up security at several of its stations, including Burdwan, Howrah and Sealdah railway stations.
"Security and vigil has been stepped across the ER with special focus on Burdwan, Howrah and Sealdah stations," said ER general manager R.K. Gupta, who during the day held a meeting with railway and security officials.
Three people, including two women, have been arrested in this connection. Political parties like the Bharatiya Janata Party and the Communist Party of India-Marxist have demanded the probe be handed over to the National Investigation Agency (NIA).