Boston Bombing Suspects May Have Had 4th Of July Attack In Mind

Boston Bombing Suspects May Have Had 4th Of July Attack In Mind
In a photo provided by Massachusetts Institute of Technology, U.S. Vice President Joe Biden speaks during a memorial service for fallen MIT police officer Sean Collier on the MIT campus in Cambridge, Mass., Wednesday, April 24, 2013. Collier was fatally shot on campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible. (AP Photo/Massachusetts Institute of Technology, Dominick Reuter)

The Boston Marathon bombing suspects may have considered a July 4th terror attack. ABC'S Aaron Katersky has details.