US kills al-Qaeda leader Ayman al-Zawahiri: What we know so far

Al-Qaeda leader Ayman al-Zawahiri, who was killed in a CIA drone attack in Afghanistan over the weekend according to US officials, appears in an undated FBI's Most Wanted poster [FBI/Handout via Reuters]

The United States has confirmed the killing of al-Qaeda leader Ayman al-Zawahiri in a drone attack in Afghanistan’s capital, Kabul.

Al-Zawahiri, who had a $25m US reward on his head, is regarded as one of the masterminds behind the September 11, 2001 attacks against the United States. He had taken over the armed group after the US killing of the then al-Qaeda leader Osama bin Laden in 2011.