Iran has continued to increase its stockpiles of enriched uranium and remains in violation of its deal with world powers, the United Nations’ atomic watchdog said Friday.

The International Atomic Energy Agency reported the finding in a confidential document distributed to member countries and seen by The Associated Press.

The agency said that as of May 20, Iran’s total stockpile of low-enriched uranium amounted to 1,571.6 kilograms (1.73 tons), up from 1,020.9 kilograms (1.1 tons) on Feb. 19.

Iran signed the nuclear deal in 2015 with the United States, Germany, France, Britain, China and Russia. Known as the Joint Comprehensive Plan of Action, or JCPOA, it allows Iran only to keep a stockpile of 202.8 kilograms (447 pounds).

The IAEA reported that Iran has also been continuing to enrich uranium to a purity of up to 4.5%, higher than the 3.67% allowed under the JCPOA. It is also above the pact’s limitations on heavy water.

The nuclear deal promised Iran economic incentives in return for the curbs on its nuclear program. President Donald Trump pulled the US out of the deal unilaterally in 2018, saying it needed to be renegotiated. Iran has since slowly violated the restrictions to try and pressure the remaining nations to increase the incentives to offset new, economy-crippling US sanctions.

Read More: Times of Israel

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