VIENNA (AP) — Iran has neutralized most of its stockpile of higher-enriched uranium that could be turned quickly into the core of a nuclear weapon, the U.N. nuclear agency said Friday, leaving the country with only about a fifth of what it would need for such a purpose.

The International Atomic Energy Agency said in a confidential report that Iran now has less than 40 kilograms (90 pounds) of the material. The report, obtained by The Associated Press, said Tehran also was meeting all other obligations under the agreement, reached four months ago as a prelude to a comprehensive deal now being negotiated.