What happend in the attack in boston marathon

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, killing 3 people and injuring several hundred others, including 17 who lost limbs.

well not the inner core.. its made entirely of lava. the crust is obviosly not it. and the outer core is made of nickel so your answer would be a the mantle

hope this