Sana'a, Rajab 26, 1436, May 15, 2015, SPA -- Yemeni Vice President and Prime Minister Khalid Mahfouz Bahah made today a telephone call to UN Secretary General Ban Ki-moon. During the telephone conversation, they discussed the latest developments in Yemen. They also reviewed efforts regarding resumption of the political process and preparations of Riyadh Summit to be held in 17, May, 2015. The UN Secretary General expressed concerns regarding deterioration of the humanitarian situation in Yemen. --SPA 17:27 LOCAL TIME 14:27 GMT www.spa.gov.sa/w