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WASHINGTON (CNN) -- Sanctions will be placed on 13 people and three companies "for their involvement in the A.Q. Khan nuclear proliferation network," the U.S. State Department said Monday.
Khan, a Pakistani scientist, operated an international black market in nuclear material to a number of states with a history of poor relations with the United States.
He was arrested in February 2004 and eventually pardoned by former Pakistani President Pervez Musharraf.
The sanctions, which follow a U.S. review of the network, "will help prevent future proliferation-related activities by these private entities, provide a warning to other would-be proliferators, and demonstrate our ongoing commitment to using all available tools to address proliferation-related activities."
The department notes that Khan spearheaded an "extensive international network for the proliferation of nuclear equipment and know-how that provided one-stop shopping for countries seeking to develop nuclear weapons."
Iran and Libya received centrifuge components, centrifuges, and designs from Khan and his associates, and the United States believes the network "provided centrifuge designs, equipment, and technology to North Korea."
The department said Khan "provided Libya with nuclear weapon designs."
The department added that Pakistan, South Africa, Turkey, the United Kingdom, Germany, the United Arab Emirates, Switzerland and Malaysia are among the governments that have worked with the U.S. "to investigate and shut down the network."
"Many of Dr. Khan's associates are either in custody, being prosecuted, or have been convicted of crimes," it said.
"While we believe the A.Q. Khan network is no longer operating, countries should remain vigilant to ensure that Khan network associates, or others seeking to pursue similar proliferation activities, will not become a future source for sensitive nuclear information or equipment."
Selim Alguadis, Kursad Zafer Cire, Muhammad Nasim ud Din, EKA Elektronik Kontrol Aletleri Sanayi ve Ticaret A.S., ETI Elektroteknik Sanayi ve Ticaret A.S., Tradefin Engineering, Muhammad Farooq, Daniel Geiges, Paul Griffin, Peter Griffin, Abdul Qadeer Khan, Shamsul Bahrin bin Rukiban, Buhary Seyed Abu Tahir, Gotthard Lerch, Gerhard Wisser and Shah Hakim Shahnazim Zain.