Boston marathon bombing

Recently in Boston as you may know there is a huge marathon that happens every year. This is a global thing , people come from all different countries to run in this marathon. A serious conflict happened when the race was coming to a close , 2 bombs were set off. Shrapnel was flying everywhere. People were injured, such as legs, and arms were cut off from this deadly bomb. These two bombs were made out of pressure cookers. The pressure cookers were filled with nails and ball bearings to maximize the damage. The FBI say that these bombs tie into the afghanistan bombs used to kill people. Three people were killed in these bombings. The pressure cookers were put into backpacks and placed near the finish line of the marathon. This is really serious because this can happen anywhere in the world. Also this can affect the tradition of the marathons.