At least three more top Iraqi officials have been apprehended, the United States said on Friday.
Abdul Tawab Mullah Hwaish, minister of military industrialisation and No 16 on the 'most-wanted' list, is in custody, a statement from the US Central Command's base in Qatar said.
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The military industrialisation ministry was established in the 1980s to develop weapons.
Also in custody is No 42 on the US list, Taha Mohieddin Ma'rouf, vice-president and member of Saddam Hussein's Revolutionary Command Council, the Centcom said.
He was one of the two vice-presidents, and a member of Saddam's council. But Ma'rouf was not considered part of the former Iraqi leader's inner circle and rarely appeared in public or made statements.
A US official in Washington said former Transport Minister Ahmed Murtada Ahmed Khalil has also been arrested. He was not on the most-wanted list.