Investigators learning more about devices in Boston bombings
Updated: Wednesday, April 17 2013, 07:39 AM EDT
BOSTON (NEWSCHANNEL 3) - The FBI is gathering surveillance video and collecting bomb fragments from near the Boston Marathon finish line, determined to answer the question on everyone's collective mind after the events of Monday afternoon.
Who did this and why?
Three people died and more than 170 were hurt in what President Obama is calling an act of terrorism.
Now, investigators are learning more about the devices planted in the crowd.
Vinita Nair has more from Boston.