The city government of Tokyo has held a drill to prepare for a hypothetical biological attack.

Even CDC, which had been preparing for a possible biological attack, made some wrong guesses, she said.

There is now little threat of an Iraqi chemical or biological attack against coalition forces, US military sources said today.

For all the decades of concern over chemical and biological attack by militants, they have been remarkably rare -and often ineffective.

The threat of an Iraqi chemical or biological attack against coalition forces has become "negligible," US military sources in Iraq said.

That supply was supposed to provide enough vaccine to inoculate 25 million Americans against the deadly bacteria in case of a biological attack.

If there were a biological attack on America or if I came down with any type of disease, I'd immediately take it again.

The protocol was finalised today by a committee established by the Minister to develop a contingency plan in the event of a biological attack.

The U.S. government contracted with the Maryland-based biotech firm to make the drug in case of a biological attack under Project BioShield, the company said.

The shelters are not built to protect against nuclear, chemical or biological attacks.

Despite years of fears, it's an open question whether terrorists are actually planning chemical or biological attacks.

A posthumous piece by slain al-Qaida propagandist Anwar al-Awlaki encourages chemical or biological attacks on America, France and Britain.

'Someone planning a biological attack could use yeast as a neutral test substance,' Rebecca said.

And most terrifying of all, the CIA warned that Iraq could conduct chemical and biological attacks inside the United States.

"But perhaps a chemical or biological attack would be easier to conceal afterward".

The public language of weaponisation took off only in the late 90s and early 00s, with renewed public concerns over biological attacks and nuclear proliferation.