The central Sagaing region has been the site of multiple skirmishes between defence forces and the military, and on Friday fighting broke out in Depayin township.
Myanmar has been in uproar since the putsch, with daily protests demanding a restoration of democracy despite the junta's increasingly forceful attempts to quell dissent.
The police and military have responded with an increasingly brutal crackdown on demonstrators, with more than 50 people killed and nearly 1,800 arrested.