Tuesday, September 11th:
The World Trade Centre is destroyed when two hijacked planes crash into its towers. Another plane hits the Pentagon in Washington DC and a fourth crashes in Pennsylvania.
US President George W. Bush pledges to "hunt down" those responsible.
Stocks and US the dollar plunge
Officials say people with possible links to Saudi-born dissident Osama bin Laden are the likely perpetrators.
Wednesday, September 12th:
Bush says he will make no distinction between the perpetrators of the atrocities and those who harbour them.
Thursday, September 13th:
US Secretary of State Colin Powell confirms that bin Laden, believed to be in Afghanistan, is a suspect.
Friday, September 14th:
Bush visits World Trade Centre ruins, having declared a national day of remembrance.
US Senate approves $40 billion for counter-terrorism, rescue and recovery, authorises the use of force against the perpetrators.
Saturday, September 15th:
Bush says the US at war, and that bin Laden is the prime terrorist suspect.
Monday, September 17th:
New York Stock Exchange reopens after longest shutdown since Great Depression.
Thursday, September 20th:
Afghan clerics recommend that bin Laden leave the country, but Washington demands he be turned over.
Saturday, September 22nd:
Bush lifts US sanctions imposed on Pakistan and India.
Monday, September 24th:
Bush says bin Laden and al-Qaeda network's assets have been frozen. Many other governments announce similar actions.
Taliban Defence Minister Mullah Obaidullah says he is mobilising 300,000 more men.
Bin Laden is quoted on television urging Pakistanis to fight any assault on Afghanistan by "crusader Americans".
Thursday, September 27th:
Taliban leader Mullah Mohammad Omar warns Afghans of perils of collaborating with the US to win power.
Bush announces $500 million in federal funding for aviation security.
Sunday, September 30th:
Taliban ambassador to Pakistan says his movement is hiding bin Laden for his own safety.
Tuesday, October 2nd:
NATO invokes mutual defence clause after US produces "conclusive" evidence bin Laden is behind the attacks.
Friday, October 5th:
US defence official says 1,000 US light- infantry troops en route to Uzbekistan.
Saturday, October 6th:
G7 finance ministers and central bank chiefs promise new measures to track down groups that fund terrorism.
White House rejects Taliban offer to free eight aid workers if US halts threats against Afghanistan.
Sunday, October 7th:
Eyewitnesses see big flashes in skies north of and near Kabul, and Bush later tells nation that the US military has begun attacks against the Taliban and al-Qaeda.