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.
Shah said the ULFA, the oldest insurgent group of Assam, agreed to abjure violence, disband the organisation and join the democratic process.
A jawan was seriously injured in an ambush by ULFA (I) militants at Kanobari in Assam's Sibsagar district on Friday.
The explosion took place at a construction material dump in the Pan Bazar area when the four passersby, including a woman, were injured around 11.45 am, the sources said.
Six ULFA anti-talk insurgents were apprehended with arms and ammunition by a joint Army and Meghalaya police team in Meghalaya along Assam border, a defence officer said in Guwahati on Wednesday.
A forensic team has also reached the spot and is carrying out investigation.
The Central Bureau of Investigation on Thursday placed Anup Chetia, founder member of banned United Liberation Front of Assam militant group, under arrest in connection with a nearly three-decade-old murder case registered by the central probe agency.
A bomb was recovered on Monday from an unclaimed bag in a train just days before Prime Minister Narendra Modi's visit to Assam
Two men came on a motorcycle and threw a grenade in front of the shopping mall at arterial R G Baruah Road just opposite the zoo around 8 pm.
The outlawed United Liberation Front of Assam (Independent) is anguished over the sorry state of Assamese film industry which has been going through a lean phase. The outfits commander-in-chief Paresh Baruah has blamed the situation on the 'overwhelming invasion' (increasing popularity) of Hindi movies.
The decision has been taken at a meeting of the Union Cabinet chaired by Prime Minister Narendra Modi.
The Centre should focus on achieving peace either through long-term ceasefire agreements or sustained military operations. Military operations which are just intermittent responses to particular incidents won't lead anywhere, says Devanik Saha.
It is not yet clear whether Kuldeep's release has been secured by paying ransom to the militants.
The operation in Nagaland and Manipur was carried out after the army received "credible and specific" intelligence.
Those who have studied Assam elections say the high turnout has the Congress worried.
Rijiju said the central government will rehabilitate all Indian citizens in the Naga group if they abjure violence.
The going has not been too smooth for the United Liberation Front of Asom, the violent separatist outfit that has, for decades, unleashed a reign of terror and mayhem in the north-eastern state.
Indian intelligence agencies have often claimed that left-wing extremists are trying to make inroads in the militancy-hit regions of north-east to foment further unrest. But Jaideep Saikia, noted terrorism and conflict analyst, claims, "People who speak of Maoism taking roots in the north-east have not read history".
Electioneering for the third and the final phase of polling in Assam to be held on April 24 in six constituencies - Gauhati, Dhubri, Kokrajhar, Barpeta, Mangaldoi and Nowgong -- came to an end on Tuesday afternoon with the election department expecting a high turn out on the basis of overwhelming response of voters in the last two phases of polling in the state.