From rage to grief, the nation responds to the attack online.
Monday's race was supposed to commemorate the victims of the Sandy Hook massacre but a series of bombings turned the race into its own national tragedy.
[&lt;a href="//storify.com/atvnusc/chaos-rocks-the-boston-marathon" target="_blank"&gt;View the story "Chaos Rocks the Boston Marathon." on Storify&lt;/a&gt;]
Two Dead, Dozens Injured in Boston Marathon Explosions
Police Heightening Security After Boston Bomb Blast
Boston University Student Reacts to Deadly Marathon Explosion
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USC defeats UCLA with stellar play from their Freshmen.