Bulgarian police have released a composite image of the suspected suicide bomber who killed five Israeli tourists and a local driver on a bus on 18 July.
The bomber, who blew up a bus in the Black Sea resort of Burgas, has not been identified yet.
Forensic experts created the image of a dark-haired man with pale skin. The bomber’s head was found at the scene.
Police suspect that he entered Bulgaria in June and had accomplices.
But Bulgaria has declined to back Israeli claims that Iran and the Lebanese militant group Hezbollah played a role.
As well as those killed, dozens of people were wounded in the blast.
Shortly after the bombing, Bulgarian authorities released CCTV images of the suspected bomber, but they appeared to contrast with some witness descriptions.
So far no match has been found in international databases for the fingerprints and DNA samples taken after the bombing.