SOFIA, Bulgaria — Bulgarian police on Wednesday released a computer-generated image of the suicide attacker involved in the bombing in Bulgaria that killed five Israeli tourists and a Bulgarian bus driver two weeks ago.

A police statement said the image of the dark-haired man was produced after reconstructing the badly damaged face of the bomber, who was decapitated in the explosion at a popular vacation resort on July 18.

The photo was sent to partner services for possible identification after fingerprints and DNA samples taken from the bomber did not match anything in international databases, said Interior Minister Tsvetan Tsvetanov.

He told reporters the explosives were attached to the bomber's back. Earlier reports had said the bag of explosive was placed in the luggage compartment of a bus the tourists were traveling in at Burgas airport.

Investigators, who had found only the bomber's head and limbs, also were suggesting the bomb had been attached to his torso.

Tsvetanov said the attacker had spent "at least 20 days in Bulgaria ahead of the bombing."

Last week, Prime Minister Boiko Borisov said a sophisticated group of conspirators was involved in the bombing at the Black Sea resort town.

Israel has blamed the attack on Iran and its proxy groups, including the Lebanese militant group Hezbollah. Iran has denied responsibility, and Bulgarian authorities have not blamed any particular group.

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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)