A spokesman for the Ta'ang National Liberation Army (TNLA), one of two major groups still locked in conflict with Myanmar's military, said two helicopter gunships attacked its troops in northern Shan state on Tuesday.
"In the evening of February 3rd, there was attack by gunships and some villagers were injured as well," major Tar Pan Hla told AFP, adding that "shooting came from two helicopters".
Clashes between Myanmar's army and ethnic minority rebel groups in Kachin and Shan states have escalated in recent weeks, undermining attempts to broker a nationwide ceasefire and end decades of bloodshed in border regions.
Tar Pan Hla said nine Myanmar soldiers and one TNLA solider were killed Monday when clashes erupted as rebel fighters tried to destroy opium poppy fields.
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Myanmar's government, which replaced junta rule in 2011, has vowed to end the civil wars that have been flaring on and off since independence as a key part of its reforms.
Kachin's conflict has raged since a 17-year ceasefire between rebels and the government splintered in 2011, driving almost 100,000 civilians from their homes.
The United Nations local representative on today raised concerns about violence which flared last month around Kachin's Hpakant township, a jade-rich area near the border with China, trapping hundreds of civilians.