camera talking about killing people, poisoning water supplies, derailing trains, and starting a civil war. motherine herridge has more. reporter: on canadian patrick mathews computer, agents found a profanity-laced video he taped declaring, if you want the white race to survive derail some f-ing trains, kill some people and poison some water supplies. matthews and two associates were drrested last week in an f.b.i. sweep of the neo-nazi group the base. they discussed traveling to monday s gun rights rally in richmond to start a full-blown civil war. u.s. attorney robert hearse said the men were doing more than just talking about violence, having built an assault rifle and purchasing more than 3,000 rcunds of ammunition. they packed food and supplies, including a gas mask, intending to load their truck for the war in virginia. reporter: three other alleged members of the base were catherine herridge, cbs news,st