Ayman al-Zawahri urges young Muslims to take Boston Marathon bombing, Charlie Hebdo shootings as examples.
Boston Marathon bombing
Even a hawk like PM Benjamin Netanyahu seems to believe that instituting the death penalty for terrorist acts would be a mistake.
'I am sorry for the lives that I've taken, for the suffering that I've caused you, for the damage that I've done, irreparable damage,' said 21-year-old Dzhokhar Tsarnaev before being formally sentenced to death.
Given the sentencing hearing, prison assignment and appeal process, death by lethal injection may take years to carry out.
The 2015 race comes less than two weeks after Dzhokhar Tsarnaev was convicted by a federal jury on 30 counts related to the 2013 bombing that killed three people.
The jury will now determine whether the ethnic Chechen is sentenced to death or to life in prison.
Content found on Dzhokhar Tsarnaev's computer included Al-Qaida-produced magazine, Inspire.
Suspect in 2013 terror attack that killed 3 and injured more than 260 faces 30 charges in the bombings and the shooting death days later of a police officer.
Dzhokar Tsarnaev reportedly admitted involvement in the 2013 attack before he had been informed of his rights to legal representation.
Ibragim Todashev, as acquaintance of Tamerlan Tsarnaev, told investigators that Tsarnaev participated in the murders of three men found stabbed to death in September 2011.