"We have increased the inspection days, inspector staff numbers and images".
Iran has been declared compliant with the nuclear deal signed between Tehran and six world powers in 2015, International Atomic Energy Agency (IAEA) confirmed on Monday.
UN Ambassador Nikki Haley made a case last week for how the United States could back away from the landmark agreement.
"The nuclear-related commitments undertaken by Iran under the [deal] are being implemented", he said in the text of a speech to a quarterly meeting of the IAEA's 35-member board of governors.
USA president Donald Trump said earlier that he was going to declare Iran non-compliant by the next State Department's report, scheduled for October, but so far he hasn't found any support from other signees of the deal.
"From a verification point of view, it is a clear and significant gain".
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A third lawsuit was filed last week by the University of California and its president, Janet Napolitano . Minnesota, Maryland and ME joined California in filing the lawsuit in federal court in San Francisco.
Amano said the IAEA is conducting its inspection of Iran's nuclear activities in "an impartial and objective manner".
The IAEA reported August 31 that Iran stuck to its commitments under the pact, which capped nuclear work in exchange for sanctions relief, and Trump has until October 15 to decide whether to certify Iran's compliance. "We know from the Central Intelligence Agency that Iran did have a nuclear weapons program before 2004, and we know from the JCPOA that they stopped it".
"We will continue to implement the Additional Protocol in Iran, including carrying out complementary accesses to sites and other locations, as we do in other countries with additional protocols", he noted.
"The verification regime in Iran is the most robust regime ... now existing". "I cannot tell you how many complementary accesses we have had, but I can tell you that we have had access to locations more frequently than many other countries with extensive nuclear programs", Reuters quoted him as saying.
The Agency has been verifying and monitoring the implementation by Iran of its nuclear-related commitments under the Joint Comprehensive Plan of Action since JCPOA Implementation Day in January 2016. All signatories are pleased with the two-year pact, except the controversial US President Donald Trump who has hardened the country's hostile rhetoric against Iran. Iran's President Hassan Rouhani has warned that while his country won't be the first to violate the terms of the accord, it also won't stand by and allow the U.S.to disregard its own obligations.
Last month, a DPRK Team was formed in the Department of Safeguards to enhance the ability to monitor the DPRK's nuclear program, according to IAEA. "This increased level of transparency is to the benefit of all, including the United States".