On Friday, President Bush promised "to rid the world of evil" as he led a national day of prayer and remembrance.

Planning for a military option to attack targets in Afghanistan - where Mr Bin Laden's bases are located - is going ahead.

However, officials have cautioned that other groups may also have been involved in Tuesday's attacks.

On Saturday, Iraqi President Saddam Hussein advised the US to use wisdom, not force, in retaliation for the attacks on New York and Washington.

He is the only world leader to have publicly expressed sympathy with the attackers, commenting that the "American cowboy was reaping the fruits of his crimes against humanity".

In other developments:

Two other men are detained in Texas after flying west from the East Coast on the day of the attacks

The US Department of Justice releases the names of 19 suspected hijackers and 100 people it wants to interview

Investigators recover both sets of flight recorders from the Pentagon and Pennsylvania crash sites

Congress approves a $40bn emergency package to finance aid and counter-terrorism measures

Non-American airlines resume flights to the US

Pakistan's Government meets for a second day to consider its response to American requests for assistance in any military strike against Afghanistan

Afghanistan's ruling Taleban warn that they may attack any neighbour that assists the US in striking against their country