The United States has killed Al-Qaeda chief Ayman al-Zawahiri in a drone strike in Kabul. US President Joe Biden announced that the CIA strike to eliminate al-Zawahiri was carried out on Saturday. He also added that no family member of the slain terrorist was harmed during the operation. Zawahiri's killing is the biggest blow to the terror group since its founder Osama bin Laden was killed in 2011. Watch this video to know more.