The American people will say a prayer for Boston tonight. And Michelle and I send our deepest thoughts and prayers to the families of the victims in the wake of this senseless loss... We still do not know who did this or why. And people shouldn't jump to conclusions before we have all the facts. But make no mistake - we will get to the bottom of this. And we will find out who did this; we'll find out why they did this. Any responsible individuals, any responsible groups will feel the full weight of justice.

President Obama Speaks on the Explosions in Boston (15 April 2013)

President Obama Speaks on the Explosions in Boston | whitehouse.gov[obamawhitehouse.archives.gov]