I don't necessarily agree with every speaker, or every point raised, but in general this is an excellent overview of just SOME of the problems with the FBI's official story.
2013.5.3 The Truthseeker E14; Boston Bombing, What You Aren't Told (RT, youtube.com):
Triggers pulled on 4th, 2nd & 1st Amendments distracted by flag waving; clunky FBI propaganda; and unleash the War on Bathtubs. Seek truth from facts with former Marine Corps officer James Fetzer, editor of Storyleak Anthony Gucciardi, the Corbett Report's James Corbett, Questioning the War on Terror author Kevin Barrett, Boston eyewitnesses, and Fmr. Rep. Ron Paul.