Al Qaeda warns of ‘gravest consequences’ if Boston Marathon bomber executed

Al Qaeda is warning the United States of the “gravest consequences” if authorities execute Dzhokhar Tsarnaev, the convicted Boston Marathon bomber.

{mosads}The threat came in a new video from al Qaeda leader Ayman al-Zawahri, Reuters reported Friday. Zawahri also warned the U.S. not to execute any Muslim prisoners.

Tsarnaev learned to build explosives from an Al-Qaeda sponsored magazine. He was sentenced to death on May 15, 2015, for killing three and injuring over 260 people in the 2013 Boston Marathon bombing.