Burgas airport has reopened and is functioning normally, Tsvetanov said, but access was restricted to passengers.

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Before publishing its report, Bulgaria had avoided making public any suspicions about who was behind the Burgas attack.

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Israeli officials said passengers from a Tel Aviv-Burgas flight boarded the bus shortly after 17:00 local time (14:00 GMT) on Wednesday.

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In 2004, BalkanLeaks co-founder Assen Yordanov was also attacked and beaten by a group of assailants outside his apartment in Burgas, Bulgaria after publishing an article on allegedly corrupt land sales.

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U.S. officials expect Bulgarian investigators to link the militant group Hezbollah to the July 18 attack in the coastal city of Burgas, in which a bomb ripped through a bus that was carrying the tourists to their hotel.

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