Washington: World's most wanted terrorist Osama bin Laden, known as the mastermind behind the worst-ever terror attack on US soil, has been killed in an operation in Pakistan.

Following is a chronology of Osama's life and his terror operations:

1957: Osama Bin Laden was born in Saudi Arabia. He was the 17th of 52 children of construction magnate Muhammad Awad bin Laden, an immigrant from neighboring Yemen, who runs a construction company, the Saudi bin Laden Group.

1979: Osama went to Afghanistan to help Afghan resistance fighters, known as the mujahedeen, repel the Soviet invasion of the country.  He became the chief financier of an organisation, which evolves into a group known as al Qaeda (the base).

1989: After the Soviets pulled out of Afghanistan, bin Laden returned to Saudi Arabia to work for the family construction firm. There he used his network to raise funds for veterans of the Afghan war.

1991: He was expelled from Saudi Arabia due to his anti-government activities. Eventually, Saudi Arabia revoked his citizenship and his family disowned him as well. He took refuge in Sudan.

1993: A bomb at the World Trade Center killed six and wounds hundreds. Six Muslim radicals, who the US officials suspect have links to bin Laden, were eventually convicted for the bombing.

1995: A pair of truck bombs exploded outside the US embassies in Nairobi, Kenya, and Dar es Salaam, Tanzania, killing 224 people.

1996: Under pressure from the US and Saudi Arabia, the Sudanese expelled bin Laden from the country. Bin Laden moved with his 10 children and three wives (he was rumored to have since added a fourth) to Afghanistan and declared a jihad, or holy war, against US forces.

1998: US court indicted bin Laden for role in embassy bombings, with USD 5 million bounty offered for bin Laden.

2000: Suicide bombing of USS Cole in Yemen killed 17 US sailors.

2001: Four of bin Laden's alleged supporters were convicted May 29 of the 1998 bombings of the US embassies in Africa.

2001: AI Qaeda masterminded September 11 attacks on the twin towers of World Trade Center and Pentagon, killing more than 3,000 people.

Post September 11 terrorist attacks in the United States, the US government named bin Laden as a prime suspect.
US forces then failed to kill bin Laden hiding in Tora Bora mountains in Afghanistan. Bin Laden and his forces reportedly escaped by mules to Pakistan.

2002: The US-led military operation progressed as the Taliban collpased. In March, the battle intensified in the mountainous terrain of eastern Afghanistan, where reports say bin Laden is located and, according to some, directing troops.

2002: Bin Laden maintained a low profile in spring and but made headlines again in the fall when Al-Jazeera broadcasted two audio tapes.

2003: Bin Laden called Muslims across the world to set aside their differences and join in the "blessed and thankful jihad."

2004: On January 4, Al-Jazeera again broadcasted audiotape that CIA officials say is likely a recent recording of bin Laden. On the tape, bin Laden said the US occupation of Iraq is the beginning of an occupation of Persian Gulf states to control their oil reserves.

2009: US Secretary of Defence Robert Gates said officials had no reliable information on Bin Laden's whereabouts for "years".

2011: US kills bin Laden in special operation outside the Pakistani capital Islamabad.