Al Qaeda's second-in-command Ayman al-Zawahri speaks from an unknown location, in this still image taken from video uploaded on a social media website June 8, 2011. REUTERS/Social Media Website via Reuters TV

Al Qaeda’s second-in-command Ayman al-Zawahri speaks from an unknown location, in this still image taken from video uploaded on a social media website June 8, 2011. REUTERS/Social Media Website via Reuters TV

Al Qaeda's second-in-command Ayman al-Zawahri speaks from an unknown location, in this still image taken from video uploaded on a social media website June 8, 2011. REUTERS/Social Media Website via Reuters TV

June 11, 2016 5:57 AM (UTC+8)