Myanmar's junta leader Min Aung Hlaing says deposed elected leader Aung San Suu Kyi was healthy at home and would appear in court in a few days, in his first interview since overthrowing her in a February 1 coup.

The coup has plunged the South-East Asian country into chaos.

On Saturday, one of several ethnic armed groups opposed to the junta advanced to attack a military post in a north-western jade mining town, local media said.

Ms Suu Kyi, a Nobel Peace Prize laureate for her long struggle against previous military rulers, is among more than 4,000 people detained since the coup.

She faces charges that range from illegally possessing walkie-talkie radios to violating a state secrets law.

"Daw Aung San Suu Kyi is in good health. She is at her home and healthy. She is going to face trial at the court in a few days," Min Aung Hlaing said by video link with the Hong Kong-based Chinese language broadcaster Phoenix Television on May 20, in excerpts released on Saturday.

The interviewer asked him what he thought of the performance of Ms Suu Kyi, 75, who is widely admired in the country of 53 million for her campaign that had brought tentative democratic reforms which were cut short by the coup.

He reiterated that the army had seized power because it had identified fraud in an election won by Ms Suu Kyi's party in November — although its accusations were rejected by the then election commission.

He said the army would hold elections and that potential changes to the constitution had been identified and would be made if they were "the people's will".

Ms Suu Kyi's next court appearance is due on Monday in the capital, Naypyidaw. So far, she has appeared only by video link and has yet to be allowed to speak directly to her lawyers.

The junta has cited security reasons for not allowing her to speak to her lawyers in private at a time when the military authorities have not yet established control of the country.

They face daily protests, strikes and renewed insurgencies.

Fighting erupts near a mine

The Kachin Independence Army (KIA) attacked an army post at Hkamti township in the Sagaing region in Myanmar's north early on Saturday, the Irrawaddy and Mizzima online publications said.

Pictures showed columns of dark smoke rising from the scene.

KIA spokesman Naw Bu said he was aware of the attack but could give no details. A junta spokesman was unable to be reached for comment.

Mizzima said the site attacked was near a mining venture that involves the military-owned Myanma Economic Holdings Ltd conglomerate.

Independent broadcaster DVB said three members of the security forces had been wounded and nine were captured by the insurgents.

Reuters was unable to confirm the reports independently.

Since the coup, open conflict resumed between the army and the KIA, which has been fighting for greater autonomy for the Kachin people for some six decades and has voiced support for anti-junta protesters.

Mizzima said the army used jets in attacks on the KIA at Hkamti, a town on the Chindwin river in a remote region rich in jade and gold about 50 kilometres from the border with India.

The army has carried out numerous bombing attacks on KIA positions in recent weeks and has also clashed with ethnic armies in the east and west of Myanmar.

Security forces have killed at least 812 people since the coup, according to the Assistance Association for Political Prisoners activist group.

Min Aung Hlaing said the actual figure was around 300 and that 47 police had also been killed.

Myanmar media reported that a soldier had been killed in a shooting in the commercial hub, Yangon, on Saturday. 

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Reuters