One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is seen in Boston on April 16, 2013, one day after bomb blasts killed three and injured more than 140 people. (Associated Press0

Photo by: Elise Amendola

One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is seen in Boston on April 16, 2013, one day after bomb blasts killed three and injured more than 140 people. (Associated Press0