BOSTON (CBS) – The leader of Al Qaeda has reportedly warned the United States of the “gravest consequences” if Boston Marathon bomber Dzhokhar Tsarnaev is executed.

According to multiple reports, Ayman al-Zawahri released a new video Friday making the threat.

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Tsarnaev is specifically named in the video in which al-Zawahri threatens the U.S. if Tsarnaev or any other Muslim prisoners are executed, according to Reuters.

The FBI’s Boston office declined comment to WBZ-TV when asked about the video.

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Tsarnaev apologized for the attacks moments before he was sentenced to death in June 2015.

The super-maximum-security federal prison in Florence, Colorado, 100 miles south of Denver. (Image credit: Bob Daemmrich/AFP/Getty Images)

The super-maximum-security federal prison in Florence, Colorado, 100 miles south of Denver. (Image credit: Bob Daemmrich/AFP/Getty Images)

He is currently being held at the high-security Supermax federal prison in Florence, Colorado while he appeals the death sentence.

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Tsarnaev, 22, was convicted of federal charges in the April 2013 bombings on Boylston Street.  Three people were killed and more than 260 others were wounded.