Who Dunnit? Bulgarian suspect.
Bulgarian sources have released postmortem pictures of the suspected bus bomber. A computer-generated image has also been released in an attempt to identify the bomber.
Forensic clues have not pernmitted identification through security databases and it is thought by some that the bomber was a 'mule' - unaware of the contents of his knapsack. Other sources claim, due to the nature of his injuries, that he was wearing an explosive body pack of some kind.