The detonator and remote control used in a Bulgarian bomb attack that killed five Israelis last year were smuggled in from Poland, a newspaper reported Monday, according to the AFP news agency.
The still unidentified bomber and two accomplices smuggled in the components on a train from Warsaw on June 28, the Trud daily said, citing investigators.
The July 2012 bombing on an airport bus in the Black Sea resort of Burgas killed five Israeli tourists as well the Bulgarian driver, in an attack blamed on the Lebanese terrorist group Hizbullah.
The bomber, whose device appeared to have been triggered from afar, was also killed.
One of his suspected accomplices, Lebanese-born Australian national Meliad Farah, 32, was the man who assembled the bomb once in Bulgaria, Trud said.
The interior ministry named last week Farah -- also known as Hussein Hussein -- and a Lebanese-born Canadian identified as Hassan El Hajj Hassan, 25, as two of the bomber's accomplices.
The ministry also released pictures of the two, who are believed to be living in Lebanon, and asked for assistance in tracking them down.
According to Trud, Hassan is suspected of triggering the bomb, while investigators believe Farah might have left Bulgaria before the attack.
Last week, the 24 Hours newspaper revealed that Hizbullah wired almost $100,000 (75,000 euros) to Farah and Hassan for the attack.
It was the deadliest attack against Israelis abroad since 2004 and the first on EU soil, contributing to the EU decision last week to blacklist Hizbullah’s armed wing.