CAIRO, Egypt — The Iran-backed Houthis on Sunday raided offices of the United Nations’ food and children's agencies in Yemen’s capital, detaining at least one U.N. employee, officials said, as the rebels tighten security across Sanaa following the Israeli killing of their prime minister .

Abeer Etefa, a spokesperson for the World Food Program, told The Associated Press that security forces raided the agencies’ offices in the Houthi-controlled capital Sunday morning.

Also raided were the offices of the United Nations’ children agency, UNICEF, according to a U.N. official and a Houthi official, who spoke on condition of anonymity because they weren’t authorized to brief the media.

Ammar Ammar, a spokesperson for UNICEF, said there was “an ongoing situation” related to their offices in S

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