Al-Qaeda’s leader Ayman al-Zawahiri is threatening America.
He took command of Al-Qaeda after Osama Bin Laden was killed in 2011.
In an online video, al-Zawahiri said he will attack the U.S. if Boston Marathon bomber Dzhokhar Tsarnaev is executed.
Tsarnaev was sentenced to death by lethal injection last year for the 2013 marathon bombing that killed three people and injured more than 260 others.
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