Photos: Aftermath of Boston Marathon explosions
The city tries to function on Tuesday amidst a heavy police presence and the investigation of the fatal bombings at the Boston Marathon on Monday.
Boston Marathon aftermath
Boston police and National Guard block the intersection on Tuesday, April 16, 2013, in Boston, Massachusetts. The city is on alert after three killed and at least 144 wounded in the bombing at the Boston Marathon. (Mark Garfinkel/Boston Herald/MCT)
Aftermath of Boston Marathon explosions
Neighbors sit outside the house of Krystle Campbell's parents in Medford, Mass.,Tuesday, April 16, 2013. Campbell was killed in Monday's explosions at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)
Aftermath of Boston Marathon explosions
This undated photo provided by Bill Richard, shows his son, Martin Richard, in Boston. Martin Richard, 8, was among the at least three people killed in the explosions, Monday, April 15, 2013, at the finish line of the Boston Marathon.
Aftermath of Boston Marathon explosions
Investigators in haz-mat suits examine the scene of the second bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts killed three and injured over 170 people. (AP Photo/Elise Amendola)
Aftermath of Boston Marathon explosions
Jodie Brown of England carries her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a plane in Boston Tuesday, April 16, 2013. (AP Photo/Winslow Townson)
Aftermath of Boston Marathon explosions
Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)
Aftermath of Boston Marathon explosions
A worker returns a bag containing a runner's personal effects near the finish line of the Boston Marathon, after explosions killed three and injured more than 140 in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa)
Aftermath of Boston Marathon explosions
An Amtrak police officer stands watch at South Station in Boston Tuesday, April 16, 2013, as commuters disembark the morning after two explosions went off near the finish line of the Boston Marathon. The explosions Monday afternoon killed at least three people and injured more than 140. (AP Photo/Denise Lavoie)
Aftermath of Boston Marathon explosions
One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is seen in Boston, Tuesday, April 16, 2013, one day after bomb blasts killed three and injured over 140 people. FBI agents searched a suburban Boston apartment overnight and appealed to the public for amateur video and photos that might yield clues to who carried out the Boston Marathon bombing. (AP Photo/Elise Amendola)
Aftermath of Boston Marathon explosions
Neighbors come to pay their respects at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)
Aftermath of Boston Marathon explosions
A Boston Police officer, front left, talks with two ATF agents at the scene of Monday's Boston Marathon explosions, which killed three and injured more than 140, in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart near the finish line left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa)
Aftermath of Boston Marathon explosions
A runner passes a police officer dressed in tactical gear, who blocks a road leading to the Boston Marathon route, the morning after explosions killed three and injured more than 140 in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa)
Boston Marathon aftermath
Emma MacDonald, 21, center, cries during a vigil for the victims of the Boston Marathon explosions at Boston Common, Tuesday, April 16, 2013. Twin explosions near the marathonís finish line Monday killed three people, wounded more than 170 and reawakened fears of terrorism. (AP Photo/Julio Cortez)
Boston Marathon aftermath
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. The FBI says it has evidence that indicates one of the bombs was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)
Boston Marathon aftermath
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 black backpack that the FBI says contained one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs that exploded in the Boston Marathon was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)
Boston Marathon aftermath
Boston police stand watch over wheelchairs used in yesterday's Boston Marathon in Boston Tuesday, April 16, 2013. The bombs that ripped through the Boston Marathon crowd were fashioned out of ordinary kitchen pressure cookers, packed with nails and other fiendishly lethal shrapnel, and hidden in duffel bags left on the ground, people close to the investigation said Tuesday. (AP Photo/Winslow Townson)
Boston Marathon aftermath
A sign that reads "United We Stand" between logos for the New York Yankees and the Boston Red Sox appears at the top of Yankee Stadium before a baseball game in New York, Tuesday, April 16, 2013. The message was displayed in the wake of the Boston Marathon explosions. (AP Photo/Kathy Willens)
Boston Marathon aftermath
People leave flowers near the explosion on Tuesday, April 16, 2013, in Boston, Massachusetts. The city is in mourning today for three killed and at least 144 wounded in a "cowardly" bombing at the Boston Marathon. (Nancy Lane/Boston Herald/MCT)
Boston Marathon aftermath
Whitney Kleniert, UMass Boston student who had watched the marathon from near the finish yesterday, wipes away a tear after placing flowers at a barricade at the intersection of Boylston Street and Arlington Street on Tuesday, April 16, 2013, in Boston, Massachusetts. The city is in mourning today for three killed and at least 144 wounded in a "cowardly" bombing at the Boston Marathon. (Nancy Lane/Boston Herald/MCT)
Boston Marathon aftermath
Members of the Boston Metro SWAT team guard Tufts Medical Center as a patient rolls by on Tuesday, April 16, 2013, in Boston, Massachusetts. The city is in mourning today for three killed and at least 144 wounded in a "cowardly" bombing at the Boston Marathon. (Matt Stone/Boston Herald/MCT)
Boston Marathon aftermath
Isabelle Atkinson places a balloon and flowers at a makeshift memorial near the bombing site on Tuesday, April 16, 2013, in Boston, Massachusetts. The city is in mourning today for three killed and at least 144 wounded in the bombing at the Boston Marathon. (Matt Stone/Boston Herald/MCT)
Boston Marathon aftermath
Lizzie Lee, 56, of Lynwood, Wash., who was participating in her first Boston Marathon and 11th overall, holds a candle and a flower at Boston Common during a vigil for the victims of the Boston Marathon explosions, Tuesday, April 16, 2013, one day after bombs exploded at the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

