By Terry Frieden

April 24, CNN

WASHINGTON -- Attorney General Michael Mukasey warned Wednesday that organized criminal networks have penetrated portions of the international energy market and tried to control energy resources.

In a speech at the Center for Strategic and International Studies in Washington, he said similar efforts have targeted the international financial system by injecting billions of illicit funds to try to corrupt financial service providers.

Mukasey then vowed to beef up U.S. efforts to fight international organized crime, which he called a growing threat to U.S. security and stability.

The attorney general and top law enforcement officials from the FBI, Immigration and Customs Enforcement and the Justice Department Criminal Division said a classified threat assessment prompted the creation of a strategy to combat the threat.

It calls for several U.S. agencies and their overseas counterparts to better prioritize their targets, to improve information sharing and to boost cooperation in law enforcement investigations and operations.

"The activities of transnational and national organized criminal enterprises are increasing in scope and magnitude as these groups continue to strengthen their networking with each other to expand their operations," said FBI Deputy Director John Pistole.

Officials declined to discuss specific cases because the information remains classified, and disclosure could jeopardize ongoing investigations.

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photo: Attorney General Michael Mukasey speaks Wednesday at the Center for Strategic and International Studies (AFP/Getty Images)