The United Nations confirmed the arrest of 11 of its employees by Yemen’s Iran-aligned Houthis, a spokesman in New York said on Friday. “I can confirm that the Houthi de facto authorities have detained 11 United Nations national personnel working in Yemen,” a spokesman said. “We are very concerned about these developments and are actively seeking clarification from the Houthi de facto authorities regarding the circumstances of these detentions.” The UN is using all available channels to secure the release of its personnel, he said. Local sources in Yemen close to the UN groups said on Friday t…