An inquiry by a federal watchdog agency found no evidence that scientists at the National Oceanic and Atmospheric Administration manipulated climate data to buttress the evidence in support of global warming, officials said on Thursday.

The inquiry, by the Commerce Department’s inspector general, focused on e-mail messages between climate scientists that were stolen and circulated on the Internet in late 2009 (NOAA is part of the Commerce Department). Some of the e-mails involved scientists from NOAA.

Climate change skeptics contended that the correspondence showed that scientists were manipulating or withholding information to advance the theory that the earth is warming as a result of human activity.

In a report dated Feb. 18 and circulated by the Obama administration on Thursday, the inspector general said, ‘We did not find any evidence that NOAA inappropriately manipulated data.