The United States killed al Qaeda leader Ayman al-Zawahiri in a drone strike

Zawahiri, who just turned 71 years old, had remained a visible international symbol of the group, 11 years after the US killed Osama bin Laden

Zawahiri was sheltering in downtown Kabul to reunite with his family, Biden said, and was killed in what a senior administration official described

In a series of tweets, Taliban spokesman Zabiullah Mujahid said, "An air strike was carried out on a residential house in Sherpur area of Kabul city on July 31."

Mujahid said the Islamic Emirate of Afghanistan "strongly condemns this attack on any pretext and calls it a clear violation of international principles and the Doha Agreement."

Biden, who was kept abreast of the strike against Zawahiri as he isolated with a rebound case of Covid-19

Zawahiri, Biden said, "was deeply involved in the planning of 9/11, one of the most responsible for the attacks that murdered 2,977 people on American soil

The President said the precision strike targeting was the result of the "extraordinary persistence and skill" of the nation's intelligence community.