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

It is hoped the entire court system will go digital by next spring, with secure electronic transfer of files between relevant parties becoming standard practice.

BBC: 'Virtual court' scheme backed by Ministry of Justice