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NEW ORLEANS (AP) -- A federal judge has refused to reduce a three-year prison sentence for a former police detective who pleaded guilty to helping cover up deadly shootings on a New Orleans bridge after Hurricane Katrina.

Prosecutors had asked U.S. District Judge Lance Africk to cut Jeffrey Lehrmann's sentence to 18 months because his testimony helped convict five current or former officers last month of civil rights charges stemming from the Danziger Bridge shootings.

Africk rejected that request Thursday, saying Lehrmann already has been sufficiently rewarded for his cooperation. The judge also noted Lehrmann waited roughly four years to tell the truth about the shootings, in which police killed two people and wounded four less than a week after the 2005 storm.

Lehrmann reported to a low-security prison in Sandstone, Minn., on Monday.

(Copyright 2011 by The Associated Press. All Rights Reserved.)

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