Dzhokhar Tsarnaev, now 22 years old, was named specifically in the warning. Tsarnaev is currently on death row for the detonation of an improvised explosive device during the Boston Marathon, which killed three people and injured some 280 on April 15, 2013.

“If the U.S. administration kills our brother the hero Dzhokhar Tsarnaev or any Muslim, it… will bring America’s nationals the gravest consequences,” Zawahri said in the video statement.

Zawahri took over as the leader of al Qaeda, following the assassination of Osama bin Laden in 2011.

In the statement, Zawahri urged followers to take as many Westerners captive as possible, Reuters reports; Sputnik reported.

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