Yemen's President Abd Rabbuh Mansur Hadi left on Tuesday Saudi Arabia for the United States for a surprise visit, according to a Yemeni presidential source.
The source said that the aim of the visit is still unknown.
The source suggested that Hadi may conduct medical checks in the U.S. city of Cleveland during the visit.
The surprise visit came a few days after the Yemeni president returned from the U.S., where he conducted medical checks in"Cleveland", Ohio and attended the meetings of the UN General Assembly in New York.
Since mid-2015, the Yemeni president and a number of his cabinet members have been living almost permanently in Riyadh. His return to Aden, the interim capital, south of Yemen, has been rare, and he is returning to Riyadh.
The government-run "Saba"news agency " said on Monday that President Hadi met with Prime Minister Dr. Maeen Abdul Malik and Deputy Prime Minister Dr. Salim Khanbashi in the presence of Vice President Ali Mohsen Saleh.
According to the agency, Hadi urged the government to complete the achievement of the five goals related to the livelihood of citizens mainly in the sectors of health, education, electricity, water and roads as the nerve of development and community stability in general.
The Yemeni president returned late last September from the United States to Riyadh, after attending the meetings of the General Assembly of the United Nations and conduct medical examinations.
He is suffering from a heart problem and has been treated since 2011.
Yemen has been racked by armed conflict which broke out after the Houthis had ousted the internationally recognised government in late 2014.
The conflict escalated after a Saudi-led military coalition intervened militarily in the country in March 2015
Yemen is facing the world's worst humanitarian crisis, with around 22.2 million people out of 29 million population in need of humanitarian or protection assistance, according to the UN.