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Cliff Owen, Associated Press
Attorney General Eric Holder announces the formation of the Residential Mortgage-Backed Securities Working Group, Friday, Jan. 27, 2012, during a news conference at the Justice Department in Washington. President Barack Obama directed Holder to collaborate with several state attorneys general and other federal entities to investigate those responsible for misconduct contributing to the financial crisis through the pooling and sale of residential mortgage-backed securities. This working group will be operated out of the President's Financial Fraud Enforcement Task Force, which is chaired by Holder.

WASHINGTON — The Justice Department is tightening procedures for responding to information requests from Congress in the aftermath of a troubled arms trafficking investigation.

In Operation Fast and Furious, the Bureau of Alcohol, Tobacco, Firearms and Explosives allowed hundreds of weapons to flow across the border into Mexico.

The Justice Department told three congressional committees in a letter Friday night that it's improved coordination between agents and their managers in carrying out arms trafficking investigations.

Attorney General Eric Holder probably will face questions about the changes when he testifies Thursday before the House Oversight and Government Reform Committee. That committee has been investigating the department's mistakes in the probe since early last year.