The attack follows similar incidents on the same diamond-mining town in May that killed at least 115 people.

It also points to the inability of UN peacekeepers to contain violence in a country where government control barely extends outside the capital.

“The attack took place as the peacekeepers from the Moroccan contingent were escorting water trucks filling up in the river in order to meet the humanitarian needs of the town,” spokesman for the 13,000-strong UN mission in CAR, Vladimir Monteiro, said of the Sunday incident.

According to him, 3 others were injured in an attack he attributed to anti-balaka fighters drawn from the country’s Christian majority.

Fighters from the same group launched a foiled attack on Friday on the town’s cathedral that is housing hundreds of displaced Muslims who have been sheltering there since the May killings, Monteiro said.

Like some 500,000 others displaced in the country, many of those inside the cathedral have nowhere to return since their homes were destroyed in the May killings.

Thousands have died in the ethnic and religious conflict that broke out when mainly Muslim Seleka rebels ousted President Francois Bozize in 2013, provoking a backlash from Christian anti-balaka militias.

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