In a statement to the press, the Department of Homeland Security says that it doesn't believe the Boston bombings are part of a "broader plot" and it "continues to keep in place enhanced security measures at transportation hubs."
Here's the full statement:
“Yesterday afternoon, two explosive devices detonated in Boston, Mass., killing three and wounding over 150 people. We continue to keep those affected by this tragedy in our thoughts and prayers, especially the families and loved ones of those lost or injured. I spoke earlier today to Massachusetts Governor Deval Patrick, Boston Mayor Tom Menino, Boston Police Commissioner Ed Davis as well as Members of the Massachusetts Congressional Delegation—including Senators Elizabeth Warren and William Cowan, and Representatives Mike Capuano, Bill Keating, Stephen Lynch, Ed Markey, and John Tierney. I reiterated the Department of Homeland Security’s support to the FBI-led investigation and the Administration’s commitment to bringing whoever committed this act of terror to justice. While there is no current indication to suggest that the events in Boston are indicative of a broader plot, out of an abundance of caution, DHS continues to keep in place enhanced security measures at transportation hubs, utilizing measures both seen and unseen. We continue to urge the American public to remain vigilant and immediately report any signs of suspicious activity to local law enforcement officials.”