A confidential report with information about hundreds of U.S. civilian nuclear sites and locations of fuel for nuclear weapons was mistakenly made public this week, The New York Times reported on Wednesday.

Several nuclear exports told the newspaper the disclosures could result in only minimal damage because the outlines of the most sensitive information already was public. But the information also could "provide thieves or terrorists inside information that can help them seize the material," said David Albright, president of Institute for Science and International Security.

The 266-page report appeared on the Government Printing Office website on Monday and was removed on Tuesday after an inquiry from the Times. The document had been sent by U.S. President Barack Obama to Congress for review last month.

It was to be forwarded to the International Atomic Energy Agency as part of a U.S. campaign to open itself to stricter inspections in hopes of persuading other countries, such as Iran, to do the same.

The Times said the document had no military information about U.S. nuclear weapons but included a detailed list of sites that make up the nation's civilian nuclear complex, including highly confidential sites at weapons labs.

The Times said the report was labeled "highly confidential" but not "classified," which is used for more sensitive material.