Announcing that a US drone strike had killed Al-Qaeda chief Ayman al-Zawahiri, a mastermind of the 9/11 attacks, US President Joe Biden said "justice has been delivered and this terrorist leader is no more". In a televised address, the US president said he gave the final go-ahead for the strike that successfully targeted Zawahiri in the Afghan capital over the weekend. Biden said he hoped Zawahiri's death would bring "closure" to families of the 3,000 people killed in the US on 9/11. (Video credit: ANI)