CAIRO — The United Nations said Monday it suspended its humanitarian operations in the stronghold of Yemen’s Houthi rebels after they detained eight more U.N. staffers, affecting the global response to one of the world’s worst humanitarian disasters.

In a statement, the U.N. said the “extraordinary” decision to pause all operations and programs in northern Saada province was due to the lack of necessary security conditions and guarantees. A spokesman for the Houthis didn’t immediately respond to messages seeking comment. The rebels in recent months have detained dozens of U.N. staffers, as well as people associated with aid groups, civil society and the once-open U.S. Embassy in Sanaa, Yemen’s capital. None of the U.N. staffers has been released.

The U.N. statement said the pause in operations is meant to give the Houthis and the world body time to “arrange the release of arbitrarily detained U.N. personnel and ensure that the necessary conditions are in place to deliver critical humanitarian support” in rebel-held areas.

— The Associated Press