One Bulgarian national was killed in Wednesday's attack; most of the casualties were Israeli tourists. (via Wikimedia)

According to CNN, Bulgarian police announced the possibility of a second suspect on Saturday after witness reports about the bomber clashed with the man police saw on videotape. Authorities have released information about the other man, who sources say might have been an American.

Six people, five Israeli tourists and a Bulgarian bus driver, were killed in the blast. More than 30 other people were injured in the attack.

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