The United Nations said Friday that it is alarmed by what it described as a power vacuum in Yemen after Houthis dissolved parliament and said a new interim assembly and government would be formed. "This power vacuum is of great concern to us," U.N. spokesman Stephane Dujarric told reporters. "The secretary-general and all of those who are concerned with Yemen here are following the situation very closely." Dujarric said that U.N. special envoy to Yemen Jamal Benomar was returning to Sanaa because of the escalating crisis.