By Angel Krasimirov

BURGAS, Bulgaria, July 20 (Reuters) - The man who blew up a bus carrying Israeli tourists at a Bulgarian airport, killing himself and six others, was a foreign national and Sofia is trying to pin down details with the help of foreign spy services, the interior minister said on Friday.

Israel has accused Iranian-backed Hezbollah militants of carrying out Wednesday's attack at Burgas airport, a popular gateway for tourists visiting Bulgaria's Black Sea coast. Iran has denied having any involvement.

Investigators said they managed to obtain DNA samples from the fingers of the bomber and were checking databases in an attempt to identify him. Bulgarian Prime Minister Boiko Borisov told parliament he hoped that would be done in 3-4 days.

"We are talking about a person that is not a Bulgarian citizen," Interior Minister Tsvetan Tsvetanov told a news conference. "We are exchanging information with our Israeli colleagues and the other services."

Tsvetanov said investigators were working on several leads, including the possibility that the bomber had an accomplice, but he denied media reports that a local Hezbollah cell was behind the bombing.

"Such topics, and such interpretations have not been talked about or discussed. At the moment we are focused on realistic options," he said.

The Israeli tourists had arrived in Bulgaria on a charter flight from Israel and were in the bus in the airport car park when the blast tore through the vehicle.

Closed-circuit video showed the bomber wore Bermuda shorts, a blue T-shirt and cap, blending in with other tourists as he roamed the airport for an hour before blowing up the bus.


Some analysts believe Iran is trying to avenge the assassinations of several scientists involved in its controversial nuclear programme that it blames on Israel and the United States. Israeli diplomats have been targeted in several countries in recent months by bombers who the Jewish state maintained had struck on behalf of Tehran.

The Bulgarian blast occurred on the 18th anniversary of a bomb attack on Argentina's main Jewish organisation that killed 85 people. Argentina blamed Iran, which denied responsibility. (Additional reporting by Tsvetelia Tsolova in Sofia and Dan Williams in Jerusalem; Writing by Sam Cage; Editing by Andrew Heavens)

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  • A Israeli survivor from a bombing in Bulgaria that killed seven people on Wednesday, cries as he arrives at the Ben Gurion airport in Tel Aviv, Israel, Thursday, July, 19, 2012. (AP Photo/Dan Balilty)

  • Israeli women whose relatives were among the victims of a bombing in Bulgaria that killed seven people on Wednesday, July 18, 2012 wait for their arrival at the Ben Gurion airport in Tel Aviv, Israel, Thursday, July, 19, 2012. (AP Photo/Dan Balilty)

  • Relatives mourn Maor Harush who was killed in a suicide bombing in Bulgaria during his funeral in Acco, Israel, Friday, July 20, 2012. (AP Photo/Ahikam Seri)

  • Relatives mourn Maor Harush who was killed in a suicide bombing in Bulgaria during his funeral in Acco, Israel, Friday, July 20, 2012. (AP Photo/Ahikam Seri)

  • Family and friends attend the funeral of Itzik Kolengi, 28, who was killed and his wife injured in a suicide bombing in Bulgaria Wednesday in Petah Tikva, Israel, Friday, July 20, 2012. (AP Photo/Dan Balilty)

  • Relatives mourn Maor Harush who was killed in a suicide bombing in Bulgaria during his funeral in Acco, Israel, Friday, July 20, 2012. (AP Photo/Ahikam Seri)

  • People carry the body of Itzik Kolengi, 28, who was killed and his wife injured in a suicide bombing in Bulgaria Wednesday in Petah Tikva, Israel, Friday, July 20, 2012. (AP Photo/Dan Balilty)

  • Family and friends attend the funeral of Itzik Kolengi, 28, who was killed and his wife injured in a suicide bombing in Bulgaria Wednesday in Petah Tikva, Israel, Friday, July 20, 2012. (AP Photo/Dan Balilty)

  • Relatives cry over a coffin of victims killed in bombing in Bulgaria after the remains arrived at Tel Aviv airport, Israel, Friday, July, 20, 2012. (AP Photo/Dan Balilty)

  • Israeli soldiers carry the coffins of people killed in a bombing in Bulgaria as the remains arrived back at an airport in Tel Aviv, Israel, Friday, July 20, 2012. (AP Photo/Dan Balilty)

  • Israeli soldiers carry the coffins of people killed in a bombing in Bulgaria as the remains arrived back at an airport in Tel Aviv, Israel, Friday, July 20, 2012. (AP Photo/Dan Balilty)

  • Israeli soldiers carry a coffin of victims who were killed in bombing in Bulgaria after the remains arrived at Tel Aviv ariprt, Israel, Friday, July, 20, 2012. (AP Photo/Dan Balilty)

  • Israeli soldiers carry a coffin of victimes killed in bombing in Bulgaria after the remains arrived at Tel Aviv airport, Israel, Friday, July, 20, 2012. (AP Photo/Dan Balilty)

  • Relatives react as the coffins of people killed in a bombing in Bulgaria arrived back at an airport in Tel Aviv, Israel, Friday, July 20, 2012. (AP Photo/Dan Balilty)

  • An Israeli family cries during a military ceremony for the victims who were killed in an attack in Bulgaria, at Tel Aviv airport, Israel, Friday, July, 20, 2012. (AP Photo/Dan Balilty)

  • Relatives sit in front of the coffins of people killed in bombing in Bulgaria after the remains arrived at Tel Aviv airport, Israel, Friday, July, 20, 2012. (AP Photo/Dan Balilty)

  • This image taken from security video provided by the Bulgarian Interior Ministry Thursday, July 19, 2012 purports to show the unidentified bomber, center, with long hair and wearing a baseball cap, at Burgas Airport in Burgas, Bulgaria, on Wednesday, July 18, 2012. (AP Photo/Bulgarian Interior Ministry)

  • This image taken from security video provided by the Bulgarian Interior Ministry Thursday, July 19, 2012 purports to show the unidentified bomber, center, with long hair and wearing a baseball cap, at Burgas Airport in Burgas, Bulgaria, on Wednesday, July 18, 2012. (AP Photo/Bulgarian Interior Ministry)

  • Israelis move through the departure terminal at Ben-Gurion International Airport in Tel Aviv, Thursday, July, 19, 2012. (AP Photo/Dan Balilty)

  • Smoke rises into the sky after an explosion at Burgas airport, outside the Black Sea city of Burgas, Bulgaria, some 400 kilometers (250 miles) east of the capital, Sofia, Wednesday, July 18, 2012. A bus carrying young Israeli tourists in a Bulgarian resort exploded Wednesday, killing three people and wounding at least 20, police said. Witnesses told Israeli media that the huge blast occurred soon after someone boarded the vehicle. (AP Photo/ Burgasinfo) BULGARIA OUT

  • An unidentified injured Israeli tourist is carried in front of Borgas hospital after an explosion at Burgas airport, outside the Black Sea city of Burgas, Bulgaria, some 400 kilometers (250 miles) east of the capital, Sofia, Wednesday, July 18, 2012. (AP Photo/ Bulphoto Agency) BULGARIA OUT

  • Unidentified Israeli tourist is helped as she arrives to Bourgas hospital after a bus carrying Israeli tourists in the Bulgarian resort city of Bourgas exploded Wednesday, July 18, 2012, killing at least three people and wounding more than 20 others, police said. (AP Photo/ Bulphoto Agency)

  • An Israeli woman wounded in a bombing in Bulgaria that left five Israeli tourists dead on Wednesday is comforted by a medic at Soroka hospital in the southern city of Beersheva, Israel, Thursday, July 19, 2012. (AP Photo/Tsafrir Abayov)

  • A damaged bus is transported out of Burgas airport, Bulgaria, Thursday, July 19, 2012 a day after a deadly suicide attack on a bus full of Israeli vacationers. (AP Photo/ Impact Press Group)

  • A damaged bus is transported out of Burgas airport, Bulgaria, Thursday, July 19, 2012 a day after a deadly suicide attack on a bus full of Israeli vacationers. (AP Photo/ Impact Press Group)

  • A Jewish man reads prayers during a mourning ceremony at a synagogue in Sofia, Thursday, July 19, 2012. (AP Photo/Valentina Petrova)

  • Bulgaria's Interior Minister Cvetan Cvetanov, center, speaks during a press conference at Burgas airport, Bulgaria, Thursday, July 19, 2012 a day after a deadly suicide attack on a bus full of Israeli vacationers. (AP Photo)

  • Bulgaria's Interior Minister Cvetan Cvetanov, center, speaks during a press conference at Burgas airport, Bulgaria, Thursday, July 19, 2012 a day after a deadly suicide attack on a bus full of Israeli vacationers. (AP Photo)