UNITED NATIONS, May 10 -- The UN Security Council on Wednesday condemned "in the strongest terms" the attack on UN peacekeeping mission in the Central African Republic (CAR), which killed four peacekeepers and injured ten others.

The mission, known as MINUSCA, was attacked on Monday by suspected anti-Balaka on the Rafai-Bangassou axis, in the southeast of the Central African Republic.

According to the UN, four killed peacekeepers were Cambodians. And one Moroccan peacekeeper was reported missing in action.

In a statement, the 15-nation council urged the CAR authorities to continue the search for the missing peacekeeper and to swiftly investigate the attack to bring the perpetrators to justice.

The council members also reiterated that attacks against peacekeepers "may constitute war crimes" and expressed their support for MINUSCA to assist CAR in bringing lasting peace and stability to the country.

Despite significant progress and successful elections, the Central African Republic still suffers instability and sporadic unrest.

Clashes between the mainly Muslim Seleka rebel coalition and anti-Balaka militia, mostly Christian, plunged the country of 4.5 million people into civil conflict in 2013.