Security was increased after Boston Bomb Blast

April 15, 2013 Boston, Massachusetts, USA Multiple explosions rock the finish line of the 2013 Boston Marathon on Monday April 15, 2013 in Boston Massachusetts. (Credit Image Nicolaus Czarnecki/ZUMAPRESS.com)

Apr 15, 2013 Boston, Massachusetts, U.S. A man injured in the explosions waits for EMS behind a police line monday afternoon. The 2013 Boston Marathon was marked with tragedy when 2 bombs exploded simultaneously at the finish line in Downtown Boston on Boylston, St. Early reports have 2 deaths and over 60 injured. (Credit Image Jeremiah Robinson/ZUMA Press)

LOS ANGELES, April 16, 2013 Police officers stand guard at Union Station in Los Angeles, California, the United States, on April 15, 2013, after security was increased following multiple explosions during the 117th Boston Marathon. California emergency management officials activated a statewide threat assessment system after the explosions in Boston. (Credit Image Zhao Hanrong/Xinhua/ZUMAPRESS.com)

LOS ANGELES, April 16, 2013 A police officer checks passengers' ticket and ID at Union Station in Los Angeles, California, the United States, on April 15, 2013, after security was increased following multiple explosions during the 117th Boston Marathon. California emergency management officials activated a statewide threat assessment system after the explosions in Boston. (Credit Image Zhao Hanrong/Xinhua/ZUMAPRESS.com)