On 9 November 2006 , Manningham-Buller gave a speech to the Mile End Group at Queen Mary , University of London as a guest of Professor Peter Hennessy in which she warned that her office was tracking 30 terror plots , and 200 groupings or networks , totalling over 1,600 individuals . She stated that MI5 had expanded by 50 % since the September 11 attacks and stood at roughly 2,800 staff . She reiterated her warning that the threat " may — I suggest will — include the use of chemicals , bacteriological agents , radioactive materials and even nuclear technology "
September 11 attacks
September 11 attacks
Eliza Manningham-Buller