The United Nations agency monitoring the nuclear pact between Iran and six world powers reported today that it has found no violations of the deal meant to crimp Tehran’s ability to make atomic arms.

The International Atomic Energy Agency, however, said that Iran had begun manufacturing rotor tubes for centrifuges, the spinning machines used to enrich uranium. Iran is allowed to make the parts, but only under certain conditions.

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In its report obtained by the Associated Press, the atomic energy agency said it wants to keep a close eye on how many rotor tubes are being made and for what models of centrifuges to make sure they are being produced only in quantities and for machines allowed under the 2015 nuclear agreement. Overproduction could hint at possible plans by Iran to expand advanced centrifuge testing beyond pact limits.