Boston Marathon Bombing

 A runner looks on as Boston Police stand at Arlington and Boylston Streets in Boston following the 2 explosions during the Boston Marathon on April 15, 2013. Three people died and over 150 people were injured. The race was cancelled with runners still on course.

A runner looks on as Boston Police stand at Arlington and Boylston Streets in Boston following the 2 explosions during the Boston Marathon on April 15, 2013. Three people died and over 150 people were injured. The race was cancelled with runners still on course.

 Looking down Arlington St., Boston police patrol the area.

Looking down Arlington St., Boston police patrol the area.

 Patricia DeGuzman of Tuscon, AZ (center) meets up in a tearful reunion with daughters Melissa Velasco, 22, (left) and Vicky Velasco, 24, both of Tuscon, AZ. Both daughters were near the explosions when they occurred. They were ok. 

Patricia DeGuzman of Tuscon, AZ (center) meets up in a tearful reunion with daughters Melissa Velasco, 22, (left) and Vicky Velasco, 24, both of Tuscon, AZ. Both daughters were near the explosions when they occurred. They were ok. 

 Metro SWAT officers make their way down Dartmouth St. to Stuart St. while patrolling the area.

Metro SWAT officers make their way down Dartmouth St. to Stuart St. while patrolling the area.

 Marathon runners make their way (led by police officers) to where they are staying in the city.

Marathon runners make their way (led by police officers) to where they are staying in the city.

 Governor Deval Patrick, left, and Boston Police Commissioner Ed Davis exit a room at the Westin Hotel after a press conference on the bombings that occurred at the Boston Marathon.

Governor Deval Patrick, left, and Boston Police Commissioner Ed Davis exit a room at the Westin Hotel after a press conference on the bombings that occurred at the Boston Marathon.

Brett Crawford