Guwahati, Jul 16 (IANS): A day after the ULFA killed two innocent civilians in Assam's Tinsukia district, police in association with the army and paramilitary forces launched a massive operation on Wednesday to apprehend the culprits.

Additional Director General of Police (Law and Order) R.M. Singh, accompanied by senior police officials from Jorhat, are camping in Pengeri to monitor the situation.

On Tuesday night, militants belonging to the anti-talk faction of the ULFA shot dead Nandalal Shah (65) and his daughter Kajal (21) at their residence in Bijuliban village in Pengeri in Tinsukia district and injured three other members of the family including Shah's wife and son.

Police said they had intelligence inputs that the ULFA faction might try to attack security forces or Hindi-speaking people in the state ahead of the Independence Day celebrations next month.

Some areas of Tinsukia district saw protests on Wednesday over Tuesday's killing as hundreds of people took to the streets.

Some areas remained shut for the whole day in protest against the fresh violence by the militant outfit and the Congress-led state government's failure to provide security to the people.