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4.1  |  Iraq WMD assessments, pre-July 2002
Chemical warfare agents: UBL’s group was “assessed to have acquired a
limited and unsophisticated chemical capability” and had been “reported at one
stage to have seen potential use in assassinations and other attacks in small,
confined spaces. But given time they might develop such ideas into plans to
cause large numbers of casualties.”
Some biological warfare agents: Intelligence had indicated that “UBL and
other Islamic extremists” had “shown an interest in BW agents and their effects”.
Radiological dispersal devices: There was “a considerable body of
intelligence relating to trafficking in illicit nuclear materials, and intelligence that
UBL possesses a small quantity of uranium. The use of uranium in a radiological
dispersal device is extremely ineffective, and does not present anything other
than the most minor of radiological hazards.”
Improvised nuclear device: This would be “harder to design and build than
a radiological dispersal device. […] Such a device would be large, fragile and
probably unreliable. It would need to be delivered by a vehicle or boat, or
assembled in situ. […] Acquiring the fissile material (plutonium or highly enriched
uranium) would be the major obstacle. No terrorists have the ability to make
fissile materials, and we have no evidence that any have acquired enough for a
weapon. A terrorist with explosives expertise could detonate a nuclear weapon
acquired from a nuclear-armed state, although it is unlikely to give its intended
yield, if any.” There was “no credible intelligence to suggest that UBL or any
other terrorist had acquired a nuclear device from the former Soviet Union”.
131.  The Assessment stated that the forms of possible attack from those threats were:
“… not new in themselves. We assessed in 1990 that Iraq could use chemical and
biological agents in covert attacks on western countries as well as in conflict. But
the 11 September attacks highlight the risk that extremist groups might turn to these
means of attack in order to maximise death and disruption. Unlike states – in most
circumstances – such terrorists cannot be deterred by the prospect of retaliation.
“Terrorists have already shown they can cause mass casualties by conventional
means … The difficulties in making or using chemical, biological, radiological or
nuclear weapons (CBRN), though by no means insurmountable, may make those
options less attractive to them. But CW and especially BW agents have the potential
to produce casualties in excess of those seen in New York. Hence any use, or threat
of use … would generate a degree of terror and panic out of proportion to the low
probability of a successful major attack.”
132.  Addressing who might have the capability and intent to threaten the UK, the
Assessment stated that Islamist extremists had the “motivation to attack the West” and
their means of operation made them “particularly difficult to identify and disrupt”. The
US was “their main target”. Most Islamic extremists had not targeted the UK “to date”,
but “the UK, France, Israel and ‘the West’ generally” were a “second rank in their
list of priorities”.
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