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.

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