The violence is some of the most intense to rattle the Chinese-speaking Kokang region since fighting in 2015 left scores dead and forced tens of thousands to flee into China.
The area is in northeastern Shan state, which has seen repeated bouts of heavy fighting between the army and a band of well-armed ethnic minority militias since November, undercutting a government peace bid.
The fighting has also raised fears of a repeat of 2015, when the displaced flooded across the border into China, raising tensions with Beijing.
Insurgents from the Myanmar Nationalities Democratic Alliance Army (MNDAA) "failed" in their attempt to take Laukkai, the army said, adding civilians and "some army officers" died in a series of clashes around the town.
An army source requesting anonymity told AFP late Monday that "about 7,000 local residents are fleeing to the China side because of fighting".
The rebels, who were said to be wearing police uniforms when they made the surprise raid, suffered the heaviest losses with the military recovering 20 charred bodies it says belonged to fallen insurgents.
"Almost all residents from Laukkai town are fleeing," said Brigadier General Nyo Tun Aung from the Arakan Army (AA), estimating that thousands had left.
Many rebel groups in the border region share close cultural ties with China, speaking Chinese dialects and using the country's yuan currency.
Observers believe Beijing holds some sway over the ethnic fighters and has a key role to play in peace talks that Myanmar's de facto leader Aung San Suu Kyi has tried to revive since coming to power last year.
The Northern Alliance, a coalition of armed ethnic groups that includes the MNDAA and AA, has yet to join the peace process or sign a ceasefire that was reached with a myriad of other militias in 2015.
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