Timothy McVee used amonia nitrate in the Oklahoma City Bombing back in the 90's and its a pretty easy process to make big arse bombs so there is some history there. The FBI are on the scene, all roads in and out of West and Waco are closed off with checkpoints and FBI. They are treating like it could be terror related. The plant recently under went mandatory safety checks and was given a clean bill of health. They also noted the biggest risk was a gas leak not explosions......go figure

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Funny looking German Subaru