IAEA Director General Rafael Grossi told EU lawmakers that Iran has not been forthcoming about the presence of nuclear material at three undeclared sites. Iran and the IAEA agreed to work to resolve outstanding questions about the sites in March, and Tehran had agreed to provide answers to the Agency before the IAEA Board of Governors meeting in June. Grossi said that the situation "does not look very good" and that finalizing a nuclear deal would be difficult without satisfactory information about the sites.

Iran has set up a new centrifuge component manufacturing plant in an underground part of its Natanz nuclear facility, according to the International Atomic Energy Agency (IAEA). The plant's equipment was previously located at a site in Karaj that suffered an alleged sabotage attack last year; it is now present in the Natanz site's Fuel Enrichment Plant (FEP). The FEP had previously only been used for uranium enrichment.

An Iraqi parliament fact-finding committee found no evidence of espionage activities at a residential compound struck by missiles last month in Iraqi Kurdistan. Iran had claimed responsibility for the strike and said the compound was a base for Israeli intelligence. The committee also said that the compound's owner, oil company CEO Baz Karim Barzinji, has the right to seek legal recourse from the Iranian government.

Islamic Revolutionary Guard Corps (IRGC) naval vessels seized a ship smuggling fuel in the Persian Gulf, the third reported seizure in April. The IRGC Navy said that the ship carried over 50,000 gallons of fuel. Eight foreign crew members were reportedly detained, but their nationalities were not identified. The IRGC's previous seizures occurred on April 9th and April 15th.