Bus with Israeli tourists on way to airport in Bulgaria bombed.

[Magda Hassan]

Ynet adds:

The Bulgarian media reported Sunday morning that an autopsy conducted on the bomber's remains bore out the theory that he had help. The pathologist told one television station that "The bomber had light skin, light eyes, and brown hair" a description that supports witness' reports of another individual, described as "short, Arab-looking."

…According to reports, the bomber was assisted by a person who had been seen in the resort town of Varna, another popular tourist destination for Israelis. He reportedly had documents that identified him as a US citizen named "David Jefferson," and a composite sketch has already been made public. Unconfirmed reports say that the man was captured on camera at the Varna airport at the end of June.

The current theory is that the accomplice, not the bomber, was the one who tried to rent a car to go the airport, since the person spotted was considerably shorter than the bomber himself.

Sofia News Agency reports:

The suicide bomber, who killed five Israelis and a local bus driver in Bulgaria's Burgas, received guidance by an accomplice based in the other major coastal city of Varna, media reports say. The presumed accomplice, who is believed to be a US citizen named David Jepson, was captured on CCTV footage at Varna airport at the end of June, according to unconfirmed information.

The man reportedly spent a few nights at a hotel near the Festival Congress Center in downtown Varna, but investigators find it impossible to track him down after the day of the terror attack in Burgas.