The country’s northwest has been embroiled in an increasingly brutal civil war between Myanmar’s military and Arakan Army rebels demanding more autonomy for the state’s ethnic Rakhine population.

United Nations Secretary-General Antonio Guterres strongly condemned the attack. He called for “a full and transparent investigation” and for the perpetrators to be brought to justice, his spokesman said in a statement.

The attack came amid increasing calls for a global ceasefire and protection for civilians displaced by the pandemic.