U.S. Attorney Loretta Lynch said today in a statement that "Tsarnaev coldly and callously perpetrated a terrorist attack" in Boston.

"We know all too well that no verdict can heal the souls of those who lost loved ones, nor the minds and bodies of those who suffered life-changing injuries from this cowardly attack," Lynch said. "But the ultimate penalty is a fitting punishment for this horrific crime and we hope that the completion of this prosecution will bring some measure of closure to the victims and their families.  We thank the jurors for their service, the people of Boston for their vigilance, resilience and support and the law enforcement community in Boston and throughout the country for their important work."

Only three of the 12 jurors bought into the defense argument that Tsarnaev was influenced by his older brother Tamerlan. The jurors unanimously agreed that Tsarnaev showed no remorse and they unanimously voted to put him to death.