About 3,000 villagers from Myanmar’s southeastern Karen state fled to Thailand on Sunday following air attacks by the army on an area held by an ethnic armed group, an activist group and local media said.

Myanmar’s military launched air strikes on five areas in Mutraw district, near the border, including a displacement camp, the Karen Women’s Organisation said.

“At the moment, villagers are hiding in the jungle as more than 3,000 crossed to Thailand to take refuge,” a statement from the group said.

Thai PBS reported about 3,000 had...