According to the rebels, the Myanmar military targeted a concert held by a major ethnic rebel group in the northern state of Kachin.
Opposing the military takeover of the state, Myanmar citizens have staged protests across the country while putting their lives at risk.
Thousands of people have fled renewed fighting between Myanmar's army and ethnic insurgents in the country's remote north.
The army said it has seized 22 camps of the Kachin Independence Army (KIA) since mid-November, blocking off a key timber smuggling route to China from the mainly Christian state in the Buddhist-majority country.
A landslide at a jade mine in Myanmar's Kachin state kills at least 14 people, with many more including undocumented workers feared to be missing.
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