Three people, including two former ULFA militants, were arrested on Saturday in connection with the grenade attack in Assam's Sibsagar district on Thursday that killed two people, police said.
Earlier in the day, the proscribed ULFA (I) had claimed responsibility for the grenade attack.
Eight people were picked up for questioning on Friday in connection with the incident at Demow area of the district, and three of them were arrested on Saturday. The trio also includes an employee of a petrol pump in Demow, police said.
A grenade had exploded at a hardware shop in the Demow Chariali area of the district on Thursday, killing a customer, Anup Gupta, and the shop owner, Kamal Agarwal.
Security has been beefed up in Guwahati, following the attack and reports of kidnappings in different parts of the state.
Deputy Commissioner of Police (Central) Ranjan Bhuyan said 17 suspected ULFA (Independent) linkmen have been picked up for interrogation from different parts of the city and all of them have previous criminal records and are accused of sheltering militants.
ULFA (I) Assistant Secretary Publicity and Information Arunodoy Asom, in a statement, said, "We take responsibility for Thursday's explosion and sooner or later stern action will be taken against those who betray us. But our target was not the customer Anup Gupta but the owner of the shop."
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