Investigators found white supremacist propaganda, bomb-making materials and a framed photograph of Oklahoma City bomber Timothy McVeigh at a Florida apartment where a teenager killed two roommates who had once shared his neo-Nazi beliefs before he converted to Islam, police and the FBI said. Arthurs said he converted to Islam and was upset about American bombings in Muslim countries, among other issues, according to a Tampa police report. When they arrived at the apartment the fourth roommate, Brandon Russell, was crying and standing outside the apartment's front door in his military uniform. Investigators also found a cooler filled with bomb-making material, two radioactive substances and the Nazi propaganda, according to the FBI. Russell has been charged with possession of an unregistered destructive device and unlawful storage of explosive material. Heidi Beirich, director of the Southern Poverty Law Center's Intelligence Project, said the law center had seen recent news reports on Atomwaffen members posting neo-Nazi fliers on college campuses.