[["Two brothers placed two pressure cooker bombs near the finish line at the Boston Marathon Race on April15, 2013. They were detonated about 14 seconds seconds apart and were placed about 210 yards apart. Three people were killed and 17 who lost limbs. 264 were injured.", 93.0], ["A violent attack by Muslim terrorists. They used pressure cookers to construct two bombs.", 0.0]]
what was the twenty thirteen boston marathon bombing
history,boston