FBI: 'Potential terrorist investigation' in Boston

MSNBC. Shows. Morning Joe · Hardball with Chris Matthews · PoliticsNation with Al Sharpton · All In with with Chris Hayes · The Rachel Maddow Show · The Last Word with Lawrence O'Donnell; Morning. Way Too Early · Morning Joe · The Daily RundownAn unidentified Boston Marathon runner leaves the course crying near Copley Square following an explosion in Boston Monday, April 15, 2013. (Credit: AP Photo/Winslow Townson). This post was last updated at 9:40 p.m.MSNBC. Shows. Morning Joe · Hardball with Chris Matthews · PoliticsNation with Al Sharpton · All In with with Chris Hayes · The Rachel Maddow Show · The Last Word with Lawrence O'Donnell; Morning. Way Too Early · Morning Joe · The Daily RundownMSNBC. Shows. Morning Joe · Hardball with Chris Matthews · PoliticsNation

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