The ULFA is outsourcing explosives and improvised explosive devises from the jehadi elements, he said.
At least one of the critically injured persons was feared to die in hospital later. However, the police was yet to confirm the death.
Two persons were killed and 13 others injured when an improvised explosive device planted by the banned United Liberation Front of Asom went off in the Upper Assam business hub of Tinsukia town at around 6.20 pm on Saturday.
The United Liberation Front of Asom on Thursday warned Hindi-speaking people to stay away from Assam during its "conflict" with security forces, saying there might be an upsurge of violence against them during this period.
Officials of the labour department said that the migrant workers mostly belong to the poorest sections of Dalits and backward castes and had migrated to earn a livelihood.
'We had been repeatedly requesting Bhutan government to act as a mediator between us and the Indian government and convince New Delhi to agree to focus its discussions on our main demand for sovereignty,' ULFA chief Paresh Baruah said.
Over 95 per cent of people in nine districts of Assam have rejected the banned United Liberation Front of Asom's demand for sovereignty for the state, a referendum conducted by a forum of kin of the militants has revealed.
Goswami has played a key role in talks in the past and is doing this personally.
Speaking to the media at his official residence in Guwahati on Monday, Gogoi pointed out that it was for the first time the prime minister of the country offered safe passage to ULFA leaders willing to come over to hold dialogue.
United Liberation Front of Asom militants on Sunday exploded a bomb on an Oil and Natural Gas Corporation oil pipeline in Assam's Sibsagar district in stepped up violence before Independence Day.\n\n
The peace initiative hit an apparently irresolvable stalemate, thanks to adamant postures adopted by both the ULFA and the government of India.
The Central and Assam governments are for immediate "direct talks" with the top leadership of United Liberation Front of Asom to resolve the insurgency problem of the state, Chief Minister Tarun Gogoi said on Tuesday.
The incident has come just when there were reports of cooling off of violent clashes between local Assamese and Bihari migrants.
ULFA and eight other militant outfits of the Northeast had announced the 'ban' on screening Hindi films from November 15 saying they were a tool of 'cultural invasion'.
Pranati Deka had entered the country from Bangladesh by crossing the Brahmaputra River in a boat and was travelling to Mankachar in Dhubri district (in Assam) when she was nabbed along with her accomplice.
Hospitals are working in full force with doctors desperately trying to revive the critically injured, giving oxygen to some and saline and first aid to others.
The company has informed the Assam government and the Centre about the ULFA's letter, which was delivered on September 26.
He had to undergo an emergency surgical operation and, hence, had to be moved to a place were advanced medical facilities were available.
Chief Minister Tarun Gogoi told reporters in Guwahati that his government will cease all its operations against ULFA if the group stopped its subversive activities and responded to the government's offer for talks.
ULFA militants had called for a boycott of the Independence Day celebrations in the state.
The militants fought a pitched gun-battle with CISF jawans in the camp, destroyed an empty crude oil tank and ransacked an office block before fleeing into a nearby jungle, a senior police officer said.
The exlosions were carried out by ULFA militants.
They set afire a 5000KL petrol tank, blasted a gas pipeline, attacked a police post and a commando barrack and fired at a Bihari settlement, killing two persons.
"Sovereignty is the core issue for us and we are willing to sit for dialogue anywhere if this is discussed," NDTV 24X7 quoted Barua as telling the news channel over phone.
The top court also issued notices to the Centre, Nagaland government and others on two pleas filed by the wives of Army officers named in the case.