Total costs rose due to unforeseen security measures after the 11 September attacks , and because the National Assembly did not have an independent cost appraisal of the project until December 2000 , three years after the original estimate .
Total costs rose due to unforeseen security measures after the September 11 attacks , and because the National Assembly did not have an independent cost appraisal of the project until December 2000 , three years after the original estimate .