More than 26,000 people have been displaced in Myanmar's western Rakhine state this week, the United Nations said, APA reports citing DW.
Meanwhile, a leading opposition group and residents in a village in the western Chin state said 11 civilians were killed in an air strike.
Myanmar's junta has been fighting on multiple fronts against rebel groups in various states.
Militants of the Arakan Army (AA) launched attacks on security forces in Rakhine and neighboring Chin state on Monday, which ended a cease-fire and opened another front in the conflict in Myanmar.
The AA militant group has for years demanded more autonomy for the ethnic Rakhine population. The ethnic group form the majority of the population in Rakhine, which also traditionally houses the stateless Rohingya people.
The United Nations Office for the Coordination of Humanitarian Affairs (UNOCHA) said the "clashes have resulted in the displacement" of 26,175 people.
UNOCHA said at least 11 people had been killed in military shelling of AA positions since Monday.