The call sent the police into a tizzy but it turned out to be hoax as nothing was found by the bomb squad.
A male voice called up the state secretariat control room at around 9.30 AM claiming that a bomb has been planted there which will blow up the building at 2 PM today, a senior officer in charge of security at 'Nabanna' said.
"Following the call, security has been beefed up at the Secretariat. Generally, two to three check-ups are done on regular basis but today we have added two three more layers to it," he said.
"We are trying to trace the call by locating its tower position. Hopefully the person will be nabbed soon," he said.
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A few months back, a person in his mid-50s was arrested from the city's Kalighat area for making a similar call.
On Wednesday, three phone calls were made threatening to blow up the NSC Bose International Airport. While the first two calls were made to city police headquarters in Lalbazar, the third one was made to Bidhannagar Police Commissionerate, under which the airport falls.
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