An artillery strike that hit a refugee camp near Myanmar's border with China has killed at least 29 people, including women and children, media and sources said on Tuesday, in one of the deadliest attacks on civilians since the return of military rule.

Myanmar has been embroiled in a brutal conflict in multiple regions in the wake of a 2021 coup, with ethnic minority armies and a resistance movement battling to undermine military rule after a fierce crackdown by security forces.

Sources including the shadow National Unity Government (NUG) blamed the military for the shelling, which took place close to midnight on Monday in Kachin State.