Besides, the police said that an improvised explosive device (IED) and two gelatin sticks were found during a search operation in Lakhimpur district last night.
Three low-intensity explosions, suspected to have been triggered by ULFA (Independent) insurgents, took place at two places in Tinsukia district.
There was no report of any casualty, police said.
Two blasts occurred within a gap of a few minutes in a drain near the Jagun police station, and the other at the Tirap colliery near the Ledo police station.
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Investigations are on and security has been tightened in the district, police said.
In Dima Hasao, an indefinite curfew was clamped in the Maibong area yesterday following a clash between the police and a mob that attacked a train during a bandh.
Two people, who were injured in the incident, died today.
"While one person died on the way to a hospital in Guwahati, the other succumbed at a hospital this morning," a senior government official told PTI.
To control the situation, the police fired in the air in which 10 people were injured, sources said.
Various organisations in the district had called the bandh to protest the inclusion of Dima Hasao in Greater Nagalim.
Following the deaths, a 48-hour Dima Hasao district bandh was called by a number of groups, police said.
The Republic Day function at the Haflong, the district's headquarters, was cut short after hoisting of the tricolour as there was hardly any people present.
The police recovered an IED, two gelatin sticks and several metres of wire.
No arrests have been made so far and investigations were on, the police added.
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