| April 19, 2013
Manhunt continues as Boston lifts lockdown
After a harrowing and violent 24 hours, law enforcement officials kept the Boston area and its suburbs in a state of lockdown. The men accused of the bombing brought the FBI to them by trying to make a run for it. And now that one has been killed, investigators can use his cell phone to find more information in a process called link analysis. NBC’s Pete Williams reports.