From business insider. Not sure where they got these pics from.
Anhydrous ammonia tanks on a farm. The tanks are painted white so they don't get hot in the sun Read more: http://www.businessinsider.com/why-fertilizer-explodes-2013-4#ixzz2R56Klww6
An after shot: Note the two, identical, long white horizontal tanks in the lower right. I think these would be the two ammonia storage tanks. The big 'blast area' was were the large grey building was. The big scorched area north of that would be where the office building was. The large, round concrete pad on the left was where the storage tank was. The railroad tracks are at the bottom of the pic.
