CAIRO (AP) — Houthi rebels in Yemen removed U.N. equipment and assets and took them to an undisclosed location without explanation, the world body said Friday, the latest in a series of restrictions by the Iran-backed group. Julien Harneis, the United Nations’ resident and humanitarian coordinator for Yemen , said the Houthis entered at least six unstaffed U.N. offices in Sanaa on Thursday and removed most of the telecommunications equipment and several U.N. vehicles without U.N. authorization.