In an article entitled "Iraq 'behind US anthrax outbreaks,'" in the British online newspaper The Observer International:

Leading US intelligence sources, involved with both the CIA and the Defence Department, told The Observer that the 'giveaway' which suggests a state sponsor for the anthrax cases is that the victims in Florida were afflicted with the airborne form of the disease.

'Making anthrax, on its own, isn't so difficult,' one senior US intelligence source said. 'But it only begins to become effective as a biological weapon if they can be made the right size to breathe in. If you can't get airborne infectivity, you can't use it as a weapon. That is extremely difficult. There is very little leeway. Most spores are either too big to be suspended in air, or too small to lodge on the lining of the lungs.'

In liquid form, anthrax is useless - droplets would fall to the ground, rather than staying suspended in the air to be breathed by victims. Making powder needs repeated washings in huge centrifuges, followed by intensive drying, which requires sealed environments. The technology would cost millions.

US intelligence believes Iraq has the technology and supplies of anthrax suitable for terrorist use. 'They aren't making this stuff in caves in Afghanistan,' the CIA source said. 'This is prima facie evidence of the involvement of a state intelligence agency. Maybe Iran has the capability. But it doesn't look likely politically. That leaves Iraq.'