Humanitarian Coordinator in Nigeria, Edward Kallon, in a statement, said he was utterly shocked and horrified by the gruesome killing.
Kallon commiserated with their families, friends and others.
He decried the number of illegal vehicular checkpoints set up by terrorists along main supply routes.
The UN described the workers as committed humanitarians who devoted their lives to helping vulnerable people and communities ravaged by violence.
The official stressed that safety has been UN highest priority.
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Kallon strongly condemned all violence targeting aid workers and the civilians they are assisting.
He lamented that the checkpoints disrupt the delivery of life-saving assistance and heighten the risks for civilians of being abducted, killed or injured.
“This is tragically not the first killing of kidnapped aid workers. We have repeatedly called for such devastating fate and blatant violation of international humanitarian law to never happen again,” he said.
UN added that nearly 8 million people were in need of urgent life-saving assistance.
Currently, 10.6 million people need urgent support as conflict-affected states battle coronavirus.
AFRICA TODAY NEWS, NEW YORK