Investigators Face Challenges In Wake Of Boston Marathon BombingsInvestigators face big challenges now as they probe deeper into the Boston Marathon bombings. Now, they want to know why it happened and if others were involved.
Boston Residents Breathing Easier As Authorities Continue InvestigationBoston Marathon bombing suspect Dzhokhar Tsarnaev lay hospitalized under heavy guard Saturday as people across the Boston area breathed easier and investigators tried to piece together the who and why of the deadly plot.