BULGARIA (REUTERS) - Officials in Bulgaria say the suicide bomber responsible for yesterday's deadly bombing of a bus full of Israeli tourists was carrying a fake driver's license from the state ofMichigan.  The country's interior ministry says they were able to retrieve DNA evidence and are working to confirm the bomber's true identity.  At least eight people were killed in the attack on a double-decker bus.  Israeli officials are accusing Iran of being behind the bombing.  Defense Minister Ehud Barak says the Iranian-backed militant group Hezbollah is directly responsible.