this suicide bomb in syria may have been the result of a former high school football player from vero beach, florida # . >> you are number one! >> reporter: seen here in this video posted online is alleged to have helped carry out the attack. the florida native seen ripping up his u.s. passport in this video was the son of a palestinian father and italian-american mother. the fbi investigating how he became radicalized. >> bashar al assad, your days are numbered. you're going down in flames. >> reporter: and this is former army vet, eric karun, who posted this youtube video from a battle in syria. the so-called american jihadist fought with anti-assad rebels there. the fbi began tracking his movements after he posted videos online. he was arrested last jeyear and charged with fighting with a branch of al qaeda. but he pledged to a lesser charge and served six months in prison. earlier this year, he died from an apparent drug overdose. and it's not just men accused of becoming radical islamists. nicole lynn mansfield from flynt, michigan, ended up in syria as well. mansfield had converted to