A terrorist believed to have been involved in a horrific suicide bomb attack in Bulgaria last week has emerged as one of the biggest security threats to the Olympics.
The man is thought to be carrying a U.S. passport under the name of David Jefferson and fled following the attack which killed six people last Wednesday in the resort of Burgas.
He has emerged as a top target for Israeli security agents who fear their athletes will be attacked by an Iranian terror squad operating in Europe.
