HIT: A bus full of Israeli vacationers was the target of a suicide attack by terrorists in Bulgaria last July. The bus was transporting the group to a hotel. (Associated Press)
A man carries a red-heart balloon for Valentine's Day as he passes by a column decorated with hearts in Sofia, Bulgaria, on Monday, Feb. 14, 2011. Valentine's Day, named after the Christian patron saint for lovers, has gained popularity in Orthodox-dominated Bulgaria over the past few years. (AP Photo/Valentina Petrova)
** FILE ** A bombing targeted a bus full of Israeli vacationers at the Burgas, Bulgaria, airport parking lot on Wednesday, July 18, 2012. (AP Photo/Bulgarian Interior Ministry)
Family and friends attend the funeral of Itzik Kolengi, 28, in Petah Tikva, Israel, on Friday, July 20, 2012. Mr. Kolengi was killed and his wife injured in a suicide bombing near the Burgos, Bulgaria, airport two days earlier. (Associated Press)
On July 19, 2012, a bomb on a bus taking Israelis from the airport in Sofia, Bulgaria, to their hotel at a Black Sea resort killed five of the tourists and the driver. Bulgarian officials said Tuesday that Hezbollah terrorists were behind the attack. (Impact Press Group via Associated Press)
On July 19, 2012, a bomb on a bus taking Israelis from the airport in Sofia, Bulgaria, to their hotel at a Black Sea resort killed five of the tourists and the driver. Bulgarian officials said Tuesday that Hezbollah terrorists were behind the attack. (Impact Press Group via Associated Press)
Bulgarian President Rossen Plevneliev (left) and Prime Minister Boyko Boriossov were at Tuesday's briefing when investigators said Hezbollah planned the attack. (Associated Press)
** FILE ** A bombing targeted a bus full of Israeli vacationers at the Burgas, Bulgaria, airport parking lot on Wednesday, July 18, 2012. (AP Photo/Bulgarian Interior Ministry)
** FILE ** U.S. Secretary of State Hillary Rodham Clinton talks with Bulgarian President Rosen Plevneliev before their meeting at the Bulgarian Presidency building in Sofia, Bulgaria, on Sunday, Feb. 5, 2012. (AP Photo/Oleg Popov)
