Iran has exceeded the upper limit of its low-enriched uranium reserves for the first time after the US withdrew from the accord last year. The UN's atomic watchdog also confirmed the breach in a report.
A spokesman for Iran's atomic agency said Tehran would increase uranium enrichment levels "based on the country's needs".
Last week, Iran notified China, France, Germany, Russia and the UK of its decision to halt some commitments under the 2015 nuclear deal, a year after the US unilaterally withdrew from the accord and re-imposed sanctions.
More than 200 mounds of earth contaminated with heavy metals, notably uranium, lie within sight of South Africa's commercial capital, according to the Harvard International Human Rights Clinic.
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