Myanmar’s military was accused of launching an airstrike on a camp for displaced persons in the northern state of Kachin late Monday that killed more than 30 people, including 13 children, a human rights group and local media said.

The attack on the Mung Lai Hkyet displacement camp in the northern part of Laiza, a town where the headquarters of the rebel Kachin Independence Army is based, also wounded about 60 people, a spokesperson for Kachin Human Rights Watch said on Tuesday. Laiza is about 324 km northeast of Mandalay, Myanmar’s second-biggest city.