Bombing Target of Opportunity
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Authorities suspect the Tsarnaev brothers built the explosives used to attack the Boston Marathon in the older brother's home more quickly than they expected, sources tell Fox News.
- Experts: Feds Likely Turning Up Heat on American Pal of Boston Bombing Suspect
- FBI: Bombing Suspect Texted 'LOL' When Confronted by Pal
- Body of Bombing Suspect Tamerlan Tsarnaev Claimed
- VIDEO: Father 'Shocked' by Son's Arrest in Bombing
