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0416 marathon 31

Lori McConnell shows off a sign combining a Boston Red Sox logo with a yellow ribbon to other runners Monday, April 15, 2013, in Seattle. McConnell's running supply store hosted a group run early Monday evening to bring local athletes together to honor fellow runners affected by explosions earlier in the day at the finish line of the Boston Marathon. McConnell has run the race twice. (AP Photo/Elaine Thompson)

Gallery: More photos from Boston explosion

Apr. 16, 2013 @ 01:16 PM

Investigators believe the two bombs that ripped through the crowds at the Boston Marathon, killing three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings.