The investigation was conducted beyond Bulgaria’s borders, and has convinced investigators that the attack was carefully planned by the so-called "military wing" of Hezbollah.
Under US terror designation, transactions between Americans and the three are prohibited.
The Arab-language newspaper 'Al-Hayat' quoted Western diplomats as saying that officials in Jerusalem sought to convey the message through indirect channels.
Mohamad Hassan El Husseini was born in Lebanon in 1989, had Lebanese and French citizenship and had two Lebanese accomplices, who remain at large.
Bulgarian daily quotes sources close to investigation as saying assailant was born in Algeria, lived in Morocco and was trained in Lebanon.
Chief prosecutor: Bombing suspect has officially been identified, but not yet revealed; hearing delayed due to processing of new evidence.
Hezbollah operative who remotely detonated bomb in suicide bomber's backpack left hats, towel in hotel room which yield DNA evidence.
Chief prosecutor in terror attack which killed 5 Israeli tourists and a Bulgarian bus driver says new discovery will extend investigation.
Eilat Ashkelon Pipeline Co. CEO Yossi Peled says due to red-tape, Israel at risk of falling behind competitors.
Expert: Tehran commissioned the attack in Burgas, but Hezbollah did it solo without any logistical support.