Coming a day after her hotel room in Malda caught fire, the device was fitted under a culvert and its wires were partly visible, Birbhum police superintendent RM Khan said.
The chief minister, however, reached Suri from Nalhati by helicopter.
The SP said that during security check, a police team found the device, including two gelatin sticks, two detonators, 12 batteries and a charger.
"We have detained five persons from adjacent areas for interrogation," he said.
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