The FBI asked Americans for help on Thursday for information on suspects with fake Michigan driver's licenses who are believed to be linked to the bombing of Israeli tourists in Bulgaria last year, NBC News reported. The blast ripped through a tour bus parked outside Burgas Airport, killing five Israelis and one Bulgarian, while injuring 32 others. One of at least three of the suspected bombers were also killed and a Michigan driver's license was found at the scene of the attack that authorities think may be associated with the dead bomber. Bulgarian authorities identified two suspects - an Australian, Meliad Farah, and a dual Canadian and Lebanese citizen, Hassan El Hajj Hassan – who have never been caught. Both men were reportedly seen in resort areas of Bulgaria in the weeks prior to the attack.