The UK will move towards an integrated electronic border security system, linking biometric passports and visas with electronic checks on entry and exit, helping to track and intercept terrorists and criminals and to stop illegal immigration.

BBC: Key points: Brown speech

The Federal Reserve Bank of New York, just three blocks from the World Trade Center, remained open throughout the day, though it shifted its electronic funds transfer and security transfer system to backup computers at the Federal Reserve Regional Bank in Richmond, Virginia.

CNN: Attacks prompt widespread closings

But one thing is plain: there is a big growth area for security firms in the justice system: moving prisoners, electronic tagging and actually running prisons, like Securicor's one at Bridgend, in Wales, or the three, plus three centres holding would-be immigrants, that Group 4 runs in England.

ECONOMIST: Why security firms are going upmarket