An unknown organization, Qaedat al-Jihad, over the weekend released a statement claiming responsibility for the recent bomb blast killing Israeli tourists in Burgas, threatening to carry out more attacks.
"One of our groups aided by Allah managed to bomb a bus full of Jewish tourists, plunderers of holy lands, after careful tracking," the organisation said in an email to a Lebanese newspaper, later republished by Israeli media.
However, Bulgaria's foreign ministry spokesperson Vesela Cherneva dismissed the claim, the state-run Bulgarian National Television (BNT) reported.
A bomb explosion in a bus transporting Israeli tourists from the Burgas airport on Wednesday killed seven people, including the Bulgarian bus driver and a man believed to be a suicide bomber.
Meanwhile, Israeli Prime Minister Benjamin Netanyahu told CBS Sunday that his government has "fully substantiated intelligence" that the attack was carried out by the Iran-backed Lebanese militant group Hezbollah.
On Friday Bulgaria's interior minister Tsvetan Tsvetanov, as quoted by news agency Focus, said the police is investigating the possibility that the suicide bomber had a local accomplice.