www.snopes.com

  www.theguardian.com

  www.infoplease.com

  edition.cnn.com

  www.cbsnews.com

  www.history.com

  centerforaninformedamerica.com

During the annual Boston Marathon on April 15, 2013, two homemade pressure cooker bombs detonated 14 seconds and 210 yards (190 m) apart at 2:49 p.m., near the finish line of the race...

  en.wikipedia.org

  www.educate-yourself.org

  www.britannica.com

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