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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. A man carried out a deadly suicide attack on a bus full of Israeli vacationers on Wednesday in the Black Sea resort town of Burgas, a popular destination for Israeli tourist. (AP Photo/Dan Balilty)

Bus bombing in Bulgaria

The suicide bomber

who carried out an attack that killed seven people in a bus transporting

Israeli tourists in Bulgaria, July 19 was a foreign national and Sofia is trying to pin down details with the help of foreign spy services.