." >> the teenagers, 18-year-old jimmy morris and 16-year-old phil ryan, had no alibis for the time of the bombing. >> at first, they said that they were driving past the scene when the explosion happened. then they said that they were there within moments and saw brian plawer in the moments just before the explosion. >> from a photo lineup, employees at the local radio shack store identified jimmy morris as being in their store but couldn't recall what he purchased. >> everything that the investigation showed about the teenagers indicated that they could be involved in this. >> investigators also learned that the boys were heavily involved in the game dungeons and dragons, a fantasy-oriented game played by more than 20 million people worldwide. it allows participants to assume imaginary, often violent identities. >> there had been across the country instances where the role-playing within the game of dungeons and dragons had turned violent in real life. >> both teenagers denied involvement in the bombing and were given polygraphs. >> the polygraph indicated that they were giving some