Man seen dropping bag is focus of Boston bombing investigation

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President Barack Obama walks in the rain with Col. Mike Minihan, Commander, 89th Airlift Wing, Andrews Air Force Base, followed by first lady Michelle Obama under an umbrella, prior to boarding Air Force One at Andrews Air Force Base in Md., Thursday, April 18, 2013. Obama is traveling to Boston to attend the "Healing Our City: An Interfaith Service" dedicated to those who were gravely wounded or killed in Monday’s bombing near the finish line of the Boston Marathon. (AP Photo/Susan Walsh)