A biological, chemical or nuclear terrorist attack on a Western city is inevitable, the head of MI5 told a conference today.
In the first official speech of her new job, MI5 chief Eliza Manningham-Buller said: "We are faced with a realistic possibility of a form of unconventional attack that could include chemical, biological, radiological or nuclear (CBRN).
"It is only a matter of time before a crude version of a CBRN is launched on a Western city."
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