The Bush administration has agreed to turn over to international inspectors intelligence data it has collected that it says proves Iran worked on developing a nuclear weapon until a little more than four years ago, according to American and foreign diplomats.

The decision reverses the United States- longstanding refusal to share the data, citing the need to protect intelligence sources.

The administration acted as the International Atomic Energy Agency is scheduled to issue a report as early as next week on Iran’s past nuclear activities. Administration officials hope that the nuclear inspectors can now confront Iran with what the Americans believe is the strongest evidence that the Iranians had a nuclear program.

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