Before the court judge read out the ruling, Tsarnaev broke a two-year silence apologising to victims for the bombings he and his brother Tamerlan Tsarnaev unleashed at the finish line of the marathon in April 2013, which killed three people and injured 260, a news agency reported.

"I'd like to now apologise to the victims and survivors," Tsarnaev spoke at the Boston courtroom before the federal judge announced the ruling of sentencing Dzhokhar Tsarnaev to death.

"I am sorry for the lives I have taken, for the damage that I have done, the irreparable damage," he added in low voice.

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