| http://www.w3.org/ns/prov#value | - The incident highlighted how loosely regulated some chemicals are, including the ammonium nitrate that blew up, and has some critics saying the government needs to tighten its oversight of such plants.The blast emitted a wave of energy so strong it registered as a small earthquake, knocked down people blocks away, blew out windows, left a massive 93-foot crater and curved walls of homes and buildi
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