"The incident was carried out by ULFA(I). We have identified three persons - Kalia, Udai and Jon. We are searching for them," Assam Director General of Police Khagen Sarma told reporters here.
Refuting the charge that the target of the attack was Hindi-speaking people, he said different sections of society are vulnerable and the police is "taking precautions".
On Tuesday night, Nandalal Shah (65) and his daughter Kajol Shah (21) were killed, while his wife, son and nephew were injured in indiscriminate firing by suspected ULFA(I) militants at his home in Bijuliban village under Pengeree police station in Tinsukia district.
Later, police even resorted to blank fire when people gathered for the second time to protest against Sarma's death. No one was injured.
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Following the ULFA(I) attack and police lathicharge, Tinsukia SP Arnab Deka was immediately transferred to 1st APBn as Commandant, while Karbi Anglong SP Mugdhajyoti Dev Mahanta has been posted in his place.
To protest against the ULFA(I) killing and death of a person in police lathicharge, Bhojpuri Yuva Chatra Parishad and business associations of the district today called a 12-hour Tinsukia bandh since this morning.
Additional Director General of Police (Law and Order) R M Singh has been camping in the district for the last two days and supervising the operations against ULFA(I).
Along with Singh, Assam Police DIG (Eastern Range) and four Commandants of different battalions are present.
The authorities have already deployed four companies of additional forces in the area.