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 US pulled out of the deal unilaterally in 2018. The IAEA reported that Iran has also been continuing to enrich uranium to a purity of 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. Since President Donald Trump pulled the US out of the deal, Iran has been slowly violating the restrictions. The ultimate goal of the JCPOA is to prevent Iran from developing a nuclear bomb — something that Tehran says it does not want to do. It has been open about the violations and continues to allow IAEA inspectors access to its facilities to monitor their operations. It is now in violation of all restrictions outlined by the JCPOA, which Tehran says it hopes will pressure the other nations involved to increase economic incentives to make up for hard-hitting sanctions imposed by Washington after the US withdrawal. Though Iran has been hard hit by the new coronavirus pandemic, the IAEA said it has maintained its verification and monitoring activities in the country, primarily by chartering aircraft to fly inspectors to and from Iran. It cited “exceptional cooperation” from authorities in Austria, where it is based, and Iran in facilitating the operation.