Two policemen have been killed in attacks by separatist rebels in the north-east Indian state of Assam, days ahead of India's Republic Day parade.
The rebels blew up oil pipelines, disrupting supplies, and also targeted a military base.
More than 30 people have been injured in nine bomb explosions and several grenade attacks by the separatist violence which began on Sunday.
The United Liberation Front of Assam (Ulfa) says it carried out the attacks.
"Though we tried to initiate a dialogue with the Indian government, they were not sincere," Ulfa military chief Paresh Barua told the BBC.
"They have failed to restrain the army which continues to kill our boys. So we are retaliating."
The policemen were killed in eastern Assam, when their patrol was ambushed by the rebels. Eleven others were injured in that attack.
Seventeen people, including six policemen, were injured in grenade attacks in the state capital, Guwahati.
The attack on the oil pipeline took place in northern Assam, disrupting crude oil supplies to two refineries.
"It will take some time to repair the damage," an official of the Indian Oil Corporation said.
Peace moves 'over'
An Ulfa spokesperson also confirmed the group had told India's state-run oil company ONGC to pay five billion rupees ($113m) if it wanted to operate in Assam.
Ulfa and three other rebel groups in north-east India have called for a general strike on 26 January, India's Republic Day.
The BBC's Subir Bhaumik in Calcutta says the attacks indicate that peace moves between Delhi and Ulfa look as good as over.
While separatist groups in north-east India oppose Republic Day and Independence Day celebrations as a matter of routine, Ulfa was not expected to take such action this year, our correspondent says.
Three months ago, it set up a committee of prominent citizens in Assam to carry forward the peace process with the Indian government. The Indian prime minister, along with senior cabinet colleagues, met the People's Consultative Group in Delhi to express his commitment to peace in Assam.
But there has been no further meeting since then.
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