The Israeli intelligence has registered a very high number of many telephone calls between Lebanon and Burgas three days before the deadly July 18 bus bombing.

The blast at Bulgaria's Burgas Airport killed seven, including 5 Israeli tourists, the Bulgarian bus driver and the suspected suicide bomber.

According to reports of the New York Times, which cites a a senior government official speaking on condition of anonymity, there were many telephone calls between Lebanon and Burgas in the two months before the bombing and their volume intensified in the three days before the terror attack.

The Israeli and the Bulgarian intelligence services, however, still lack solid evidence for Hezbollah's involvement in the terror attack

"We know the sources in Lebanon," though not the identity of those on the other end in Bulgaria, the official said, as cited by the NYT.

"They shouldn't know that we know the numbers in Lebanon," the government official added.

The NYT points out that the investigation of the Bulgarian authorities has reached a dead end.

The identity of the suicide bomber and his suspected accomplices is yet to be established.

Bulgaria is hesitant to declare Hezbollah responsible without ironclad proof, the NYT notes, adding that the European Union does not recognize the group as a terrorist organization.

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