mr. abousamra travelled to the fallujah area of iraq. >> there he may have made an important connection. ousamra was in fallujah at the same time that we believable that baghdadi was in fallujah. >> but what about connections back in boston? at least eight known terrorists attended this cambridge mosque, a point the mosque denies. >> is there any information you can give us about this guy, abousamra? do you remember seeing him the? >> no clue. >> why do you think this mosque keeps ending up attached to terrorists? >> it's a false accusation, you know, nobody knows. this is a mosque. everybody is welcome. >> after his jihad tour, abousamra returns home to boston and completes his computer science degree at u mass. he and others began to translate online messages from bin laden's inner circle. >> by 2006 the fbi initiated an investigation and spoke with him. >> the coconspirators would use code words like peanut butt per and jelly. >> what are you doing. >> i'm in culinary school and i just made peanut butter and jelly. >> shortly after that interview, mr. abousamra fled overseas to an area

mr. abousamra travelled to the fallujah ariea of iraq. >> he was in fallujah statemeat same time that agobagh was. >> they attended this cambridge mosque a point the mosque denies. >> is there any information you can give us about this guy abousamra. >> no. >> do you ever recall seeing him? >> no clue. >> why do you think this mosque keeps coming up attached to terrorism. >> nobody knows. this is a mosque. everybody is welcome. >> after his jihad tour he returns home to boston and completes his science degree. he along with others produce violent propaganda video and translating on-line messages from bin daued's inner circle. >> by 2006 they investigated add new investigation and spoke with him as well as mr. mohad at-batting. >> they would use peanut butter and jelly for jihad. >> what are you doing? >> i am hanging around and making peanut butter and jelly. >> he went overseas to an area we believed to be snchl indiscernible) >> he is now serving 17 years. he refused our request for an interview. >> december 2013 he was elevated to the fbi's most wanted terrorist list. >> this is the re