The US Secretary of State, John Kerry, left Doha this morning, concluding a two-days\' official visit to the State of Qatar. The Amir of the State of Qatar, His Highness Sheikh Hamad bin Khalifa, had received the US Secretary of State, Mr. John Kerry, yesterday evening and explored with him existing bilateral relations between the two countries and means to boost these relations, as well as current and latest regional and international developments, especially the situation in Syria.