Mr Blair said the 50-page report, based on intelligence and United Nations inspectors' reports, showed Iraq's weapons of mass destruction programme was "active, detailed and growing".
The dossier claims Iraq has:
- Continued to produce chemical and biological agents.
- Drawn up military plans for the use of chemical and biological weapons.
- Tried to acquire from Africa material and technology for the production of nuclear weapons.
- Illegally retained up to 20 al-Hussein missiles with a range of 650km, capable of carrying chemical or biological warheads.
- Begun developing ballistic missiles with a range of more than 1,000km.
- Learnt how to conceal equipment and documentation from weapons inspectors
Mr Blair told an emergency session of the UK Parliament: "Our case is simply this - not that we take military action come what may, but that the case for ensuring Iraqi disarmament as the UN has stipulated is overwhelming.
"I defy anyone on the basis of this evidence to say that is an unreasonable demand for the international community to make."
The Iraqi Culture Minister, Yousif Hummadi, told a news conference in Baghdad that the dossier was "baseless".
Mr Hummadi accused Mr Blair of taking part in what he called a Zionist campaign against Iraq.
- BBC News
Multimedia Home