Haven't read the article, but would guess the more likelyhood of a dirty type nuke device versus an actual blast? Either way, being suburban Chicago and working in the Intermodal Transportation Industry are two strikes against me. As far as being concerned, yes I am extremely concerned. The various media outlets warned us for some time that we were vulnerable to terrorist attack. A well thought out, rehearsed plan and maybe an out-of-town or away from town relatives or friends house (alternate routes) equipped with supplies, food, water, ammo is what most I know have planned for.