The Boston Marathon

BOSTON16.jpg

This photo released Thursday, Aug. 15, 2013, by the Richard family shows Jane Richard, 7, who lost part of her left leg in the Boston Marathon bombings on April 15, 2013, walking on a prosthetic leg in Boston. The family of Jane and her late brother Martin, 8, who was killed by one of the blasts, said in a statement that the little girl is already dancing on her prosthetic leg and “struts around on it with great pride.” (AP Photo/Richard Family)

MURPHY.jpg

** FILE ** Massachusetts State Police Sgt. Sean Murphy, right, a tactical photographer, and his son Connor Patrick Murphy, arrive at State Police Headquarters for his hearing to determine his duty status after he released images of the arrest of the Boston Marathon bombing suspect, in Framingham, Mass., Tuesday, July 23, 2013. (AP Photo/The Boston Herald, Ted Fitzgerald)

APTOPIX Penguins Brui_Lanc.jpg

Richard Donohue, the Massachusetts Bay Transportation Authority officer wounded during the shootout with the Boston Marathon bombing suspects, waves a "Boston Strong" banner as his wife, Kimberly, raises her arms during ceremonies prior to Game 3 of the Eastern Conference finals in the NHL hockey Stanley Cup playoffs between the Boston Bruins and the Pittsburgh Penguins, in Boston on Wednesday, June 5, 2013. (AP Photo/Elise Amendola)

AP13042312117.jpg

**FILE** Bar manager Maggie Brown takes inventory of wine bottles opened from a week ago at Globe Restaurant on Boylston Street in Boston, the area near the Boston Marathon finish line where two bombs killed three people, on April 23, 2013. (Associated Press/The Boston Globe)

Boston Marathon.jpg

Rachel, left, and Pam Vingsness of Newton, Mass., hug each other after crossing the finish line as runners who were unable to finish the Boston Marathon on April 15 because of the bombings were allowed to finish the last mile of the race in Boston, Saturday, May 25, 2013. (AP Photo/Winslow Townson)

METAL.jpg

** FILE ** This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. (AP Photo/FBI)

4_162013_emancipation-201304-2.jpg

Homeland Security police officers keep watch along Pennsylvania Avenue a day after the Boston Marathon bombings. Ayo Handy-Kendi (left) and others wear chains to show their opposition to the District not having a voting representative in Congress.

Boston Marathon Explo_Lanc.jpg

** FILE ** A solitary runner heads along the banks of the Charles River in Cambridge, Mass., in front of the Boston skyline, at dawn on Tuesday, April 16, 2013, after explosions killed three and injured more than 140 at the Boston Marathon the day before. (AP Photo/Charles Krupa)

OBAMATERROR16.jpg

** FILE ** President Obama finishes speaking in the Brady Press Briefing Room of the White House in Washington on April 16, 2013, about the Boston Marathon explosions. (Associated Press)

BIKES16.jpg

Boston police on bicycles patrol on Commonwealth Avenue following the explosions at the finish line of the Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/Michael Dwyer)