Two United Nations peacekeepers lost their lives and seven other individuals were wounded on Monday after unidentified armed men attacked a UN patrol en route to Pajut in South Sudan’s Jonglei state, according to the U.N. mission.

Among the seven injured were three peacekeepers, two members of the South Sudan National Police Service and two civilian staff members, the United Nations Mission in South Sudan (UNMISS) reported in a statement.

UNMISS indicated that it had sent a quick reaction force to secure the location and assist with the emergency response.

“Such deadly violence targeting UNMISS personnel who are serving to support peace in South Sudan is unacceptable,” said Anita Kiki Gbeho, the U.N. secretary-general’s special representative for South Sudan and head of UNMISS, in the statement.

Gbeho expressed condolences to the families of the fallen peacekeepers and hoped for a rapid recovery for those who were injured.

UNMISS noted that assaults on U.N. peacekeepers may amount to war crimes under international law, including international humanitarian law.

Gbeho urged the appropriate authorities to carry out a swift and comprehensive investigation and to hold those responsible accountable.

South Sudan continues to experience renewed outbreaks of violence in various areas of the country, even with a fragile 2018 peace agreement that brought an end to a five-year civil war.