A look at the deadly Boston Marathon bombing - Article Photos 3/6

A memento of flowers in a running shoe rests at a makeshift memorial in Boston's Back Bay neighborhood on Thursday, April 18, 2013, a few blocks from the finish line of the Boston Marathon, where people continue to bring special objects to mourn and honor those who were killed and injured after two bombs exploded at the finish line of the race. (AP Photo/Craig Ruttle)