The United Nations has suspended humanitarian operations in northern Saada after rebels detained eight more U.N. staffers, during one of the world's worst humanitarian crises.

This extraordinary and temporary measure seeks to balance imperative to stay and deliver with need to have safety and security of UN personnel and its partners guaranteed,' says spokesman - Anadolu Aj

The United Nations said on Tuesday that one of its staff members had died in detention in northern Yemen, where the U.N. has repeatedly called for the Houthi movement to free detained U.N. employees.