Dec. 17 (UPI) -- U.N. Secretary-General António Guterres on Wednesday called for a de-escalation in violence in Yemen and for Houthi leaders to release 59 detained U.N. workers, diplomatic-mission personnel and others.

He called the detention of the personnel, which includes staff from non-governmental organizations, civil society organizations and diplomatic missions, "arbitrary."

"The continued detention of our colleagues is a profound injustice to all those who have dedicated their lives to helping the people of Yemen," Guterres told reporters at U.N. headquarters in New York City.

"The United Nations and its partners must never be targeted, arrested or detained in connection with their official duties. We must be allowed to perform our work without interference."

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