WASHINGTON UN Secretary-General Antonio Guterres has expressed concern over the recent US airstrikes in and around Yemen’s port of Ra’s Isa, his spokesman said Saturday. Guterres is "gravely concerned about the airstrikes conducted by the United States over the course of 17 and 18 April in and around Yemen’s port of Ra’s Isa, which reportedly resulted in scores of civilian casualties, including five humanitarian workers injured," Stephane Dujarric said in a statement. His remarks came after US