The Delhi Police on Wednesday received a phone call threatening to blow up the prime minister's residence, Rajiv Chowk metro station and Bangla Sahib Gurdwara, which later turned out to be a hoax.
The Delhi Police control room received the call at 8.30 am, a senior police official said.
"Operations were carried out in the above locations and it was found that the call was a hoax. The mobile number of the caller was traced to a location in Rohini in north-west Delhi," the officer said, adding the phone was switched off immediately after the call.
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"We are trying to ascertain the identity of the caller," he said.
The city police had received a similar call of planting bombs at Red Fort last week. Mehfuz, who had made the phone call for "fun", was arrested.