A Naga separatist group in India's troubled north-eastern region says two of its bases inside Burma have been attacked this week.
The chief of the military wing of the Khaplang faction of the National Socialist Council of Nagaland (NSCN), Khitobi Zhimomi, told the BBC that Burmese troops smashed two of his bases in the Sagaing division of western Burma this week.
Former army chief General Malik: Made two visits to Burma
He described this as a major attack and said only a timely withdrawal from the two bases saved the NSCN guerrillas from suffering major losses.
However, he did not rule out some casualties in sporadic encounters with Burmese troops during the retreat, though he could not provide details.
Indian military officials have confirmed the Burmese action against the rebels - but refused to give any details.
Last week, four Indian soldiers were killed in an attack by the Burmese army, who later said they had mistaken the troops as NSCN rebels.
The Burmese later apologised for the mistake.
Military co-operation between India and Burma in tackling trans-border ethnic rebellion has increased this year following two visits to Burma by the former Indian army chief General Ved Prakash Malik and a visit to India by the chief of staff of the Burmese army, General Maung Aye.