[Updated 7:20 a.m. ET] Bulgarian police have been alerted to the possibility of a second suspect in a bomb attack that killed five Israeli tourists in Burgas, a high-level source within Bulgaria's Interior Ministry told CNN.
Investigators have determined that the bomb was detonated by a man caught on airport security videos about an hour before Wednesday's attack at Burgas International Airport. But they are now looking at the possibility that he had help.
According to the source, investigators have spoken to several eyewitnesses in attempt to identify the bomber.
They describe a man with short hair who spoke English with a "distinct" accent.
This is different from the man seen on the security video who has long hair, however, leading investigators to look into the possibility that a second person may be involved, a source said.
Police in Burgas have been given an identikit photo of the man and told to look out for anyone matching this description.
Earlier, a lower-level source at the Interior Ministry told CNN that police were looking for a second suspect, possibly an American.
That was later corrected by a higher-level source, who said a second suspect was a possibility, but had not been confirmed.FULL STORY