FBI Investigates Evidence from Marathon Bombing

Published On: Apr 16 2013 10:40:16 PM EDT   Updated On: Apr 16 2013 11:12:45 PM EDT

While the city of Boston and the nation continue to mourn the victims and try to heal..the FBI and other law enforcement are piecing together clues from the crime scene. They are focusing in on what they believe was the bomb and a black duffle bag that was used to carry the device.