Statsminister Boiko Borisov sa det var en gruppe som sto bak selvmordsangrepet på en israelsk turistbuss i Burgos. Han sa de opptrådte meget profesjonelt, men han ville ikke si noe om hvor de kom fra.

– Bulgaria er et lite land og ønsker ikke bli involvert i konflikten, sa Borisov.

Hvis man vet det er en gruppe må man sitte på kunnskap om hvem de er. Det er merkelig at det snart ikke kommer nærmere identifisering.

Obamas kontraterrorsjef John Brennan er i Sofia. Hvis Iran står bak kan det gjøre USA mer villig til å støtte et israelsk angrep på Iran.

Mr Borisov, who was speaking in Sofia alongside White House counter-terrorism chief John Brennan, said the US was supporting Bulgaria’s investigation into the attack.

Mr Borisov did not say exactly how many people had been involved in the conspiracy he described, but he said they had been «exceptionally skilled» and operated under «strict conspiracy rules» to keep the plot hidden.

Those involved used «leased vehicles, they moved in different cities so as not to be seen together, and no two of them can be seen in one place on any security camera».

«There was absolutely no chance of preventing such an act of violence,» the prime minister insisted.

«We could have only detected it by chance or if we had been informed by the services that such activities were under way in Bulgaria.»

Shortly after the bombing, Bulgarian authorities released CCTV images of the man they believed carried out the bombing, but they appeared to contrast with some witness descriptions.

Mr Borisov said authorities had shared fingerprints and DNA samples with other security services but no match had been found, and the man’s identity remained elusive.

But he added that they knew «when he arrived, the presumed flight and where it came from», reported AFP news agency.

Mr Borisov also refused to back Israeli claims of involvement by Iran or Hezbollah, saying «we do not want to get involved in this long-standing conflict as we are very vulnerable».

Bulgaria blast: Burgas bus bomber ‘part of group’

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