Police stand by near the finish line ahead of Monday's 118th Boston Marathon on April 20 in Boston. Massachusetts Gov. Deval Patrick says officials are striking a balance between more security and maintaining the city's festive spirit.

Matt Rourke / AP

Police stand by near the finish line ahead of Monday's 118th Boston Marathon on April 20 in Boston. Massachusetts Gov. Deval Patrick says officials are striking a balance between more security and maintaining the city's festive spirit.