| http://www.w3.org/ns/prov#value | - onsibility for the attack.He urged people to come forward with anything suspicious, such as hearing someone express an interest in explosives or a desire to attack the marathon, seeing someone carrying a dark heavy bag at the race, or hearing mysterious explosions recently.???Someone knows who did this,??? the FBI agent said.The bombs exploded 10 or more seconds apart, tearing off victims' limbs a
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