US President George W. Bush yesterday offered Afghanistan's Taleban leaders a second chance to hand over Osama bin Laden and spare their nation further bombardment. 'If you cough him up and his people today . . . we'll reconsider what we're doing to your country,' Mr Bush said in a press conference at the White House to mark one month since the attacks on Washington and New York. 'You still have a second chance. Just bring him in and bring his leaders and lieutenants and other thugs and criminals with him.' Defence Secretary Donald Rumsfeld also turned up the pressure on the Taleban by saying it was time for the opposition Northern Alliance to move into areas bombed in the US-led raids. 'We feel we have done a certain amount with respect to those Taleban and al-Qaeda military targets and it may very well be more appropriate for ground forces to be moving in areas where we previously have been bombing,' Mr Rumsfeld told reporters. Asked if he was referring to US ground forces, he said: 'No. There are a variety of forces on the ground that oppose al-Qaeda and oppose the Taleban.' The US was meanwhile bracing for further terrorist attacks this weekend after a sweeping warning from the FBI. Mr Bush confirmed that 'credible' intelligence had been received that America would be targeted again, possibly this weekend. 'Certain information, while not specific as to target, gives the Government the reason to believe that there may be additional terrorist attacks within the US and against US interests overseas over the next several days,' the brief FBI warning said. Mr Bush urged vigilance from Americans but told them to continue with their lives, saying the Government was doing its utmost to protect them. 'I hope it is the last [threat], but given the attitudes of the evil-doers, it may not be,' he said. The US Senate yesterday approved a range of anti-terror measures designed to increase safety for air travellers. The bill, based on recommendations from Mr Bush, authorised the presence of more armed air marshals on flights, directs that steps be taken to fortify cockpit doors and increases anti-hijacking training for flight crews. It also will put all 28,000 airport screeners and other security personnel on the federal payroll. Both Mr Bush and senior British military officials warned that the fight could take more than a year unless bin Laden was apprehended soon. Head of the British armed forces, Admiral Michael Boyce, said: 'It could be a very short haul or we must expect to go through the winter and into summer at the very least.' US and British forces are expected to be led by elite commando-type units preparing to face a guerilla-style opposition buried deep within Afghanistan's treacherous mountains.