International charity Save the Children says two of its staff are missing in Myanmar after more than 30 bodies were found following an attack blamed on the military.
Troops forced people from their cars, arrested some, killed others, and burned their bodies in eastern Kayah state, the charity says.
Children and women are believed to be among the victims of Friday's incident.
The military says it killed a number of armed terrorists in the area.
Mass protests have been taking place across Myanmar (also known as Burma) since the military seized control in February.
Elected leader Aung San Suu Kyi and members of her National League for Democracy (NLD) party are among those detained.
Hundreds of people, including children, have been killed.
