The killing of the head of Al-Qaeda, Ayman al-Zawahiri, according to the American president, has made American citizens safer wherever they are around the world, writes CNN.

During a speech addressed to the American people, Biden described Zawahiri as the "brain" of the September 11 terrorist attack that took place on the territory of the United States, where 2,977 people lost their lives, Telegraph reports.

Zawahiri was the main architect behind the attacks on the US, and was "deeply involved" in the planning of the September 11 terrorist attacks, Biden said.

CNN brings you information about the leader of the terrorist organization Al Qaeda.

Who is Zawahiri and how was he involved in politics?

Born in 1951, Zawahiri grew up in a middle class neighborhood in Cairo (Egypt).

He was the son of the eminent physician and grandson of Adbel Rahman Azzam who was the first Secretary of the Arab League.

His grandfather Rabia'a ​​al-Zawahiri was an imam at Al-Azhar University in Cairo.

Zawahiri was in prison for his involvement in the assassination of Egyptian President Anwar Sadat in 1981. At that time, during an interview conducted inside the prison, he said: "we want to talk to the whole world.

Who we are?

You will understand."

A young doctor at the time, Zawahiri was a committed terrorist who had been plotting for years to overthrow the Egyptian government and was committed to changing fundamentalist Islamic governance.

Proudly supported the assassination of Sadat after the Egyptian leader reached a peace agreement with Israel.

What was his relationship with Osama bin Laden?

Zawahiri left Egypt in 1985 to live and work in Peshawar, Pakistan, where he worked as a surgeon treating soldiers who were engaged in the war against Soviet troops in Afghanistan.

There Zawahiri was introduced to Bin Laden, the leader of the Mujahideen who also left everything behind to join the fighters in Afghanistan.

The pair became very close to each other and thus became known as the "Afghan Arabs".

Bin Laden and Zawahiri emerged in early 1998 announcing the formation of the Islamic World Front for Jihad against Jews and Christians – formally linking the Egyptian Islamic Jihad and Al-Qaeda.

"We are working with brother Bin Laden.

We have known him for over 10 years.

We fought with him in Afghanistan," Zawahiri said in May 1998, warning of the unification of this terrorist group.

Together, these two terrorist leaders signed the agreement - which emphasizes the killing and war against the Americans and their allies - as well as the killing of civilians and soldiers, which according to them was the obligation of every "Muslim".

At one point he also acted as Bin Laden's personal physician.

He took this role in the attacks of Al Qaeda in the USA.

The attacks on the US and its facilities were followed by attacks on the US embassies in Kenya and Tanzania, where over 200 people were killed and over 5,000 were injured.

Then there was the attack on the USS Cole in Yemen in October 2000, when suicide bombers on a boat detonated explosives, killing 17 American sailors and injuring 39 others.

His career "culminated" as the mastermind of the September 11 terrorist attacks, where nearly 3,000 people lost their lives in the twin towers and the Pentagon.

And the fourth plane that was hijacked in Washington - crashed in a green field in Pennsylvania when the passengers confronted the terrorists inside the plane.

Before and after the 9/11 attacks, Zawahiri appeared in dozens of audio and video recordings - calling for attacks on Western targets, calling on Muslims to support his cause.

His brother Mohammad told CNN in 2012: “Before you call me and my brother terrorists, let's define his role.

If they think he's a cold-blooded killer, they're wrong.

We are simply trying to restore some of our rights that the Western powers took from us throughout history."

When did Zawahiri start leading Al Qaeda?

Zawahiri became al Qaeda's leader after the US military killed bin Laden in 2011. He was constantly on the move after the 9/11 attacks and when US troops began landing in Afghanistan.

At one point, he narrowly avoided an attack by the American army planned to take place in the Tora Bora region of Afghanistan, an attack in which his wife and children lost their lives.

/Telegraph/