Do you know anyone running in Monday's Boston Marathon? - Article Photos 17/44

Massachusetts Gov. Deval Patrick pauses as he speaks about the explosions during a newsess conference as Boston Boston Police Commissioner Edward Davis, left, looks on, Monday, April 15, 2013, in Boston. Two explosions shattered the finish of the Boston Marathon, sending authorities out on the course to carry away the injured while stragglers in the 26.2-mile race were rerouted away from the smoking site. (AP Photo/Bizuayehu Tesfaye) ORG XMIT: MABT101