DUBAI, United Arab Emirates (AP) — Iran’s supreme leader Sunday refused US assistance to fight the new coronavirus, citing an unfounded conspiracy theory that the virus could be man-made by America.

Ayatollah Ali Khamenei’s comments come as Iran faces crushing US sanctions blocking the country from selling its crude oil and accessing international financial markets.

But while Iranian civilian officials in recent days have increasingly criticized those sanctions, 80-year-old Khamenei instead chose to traffic in the same conspiracy theory increasingly used by Chinese officials about the new virus to deflect blame for the pandemic.

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“Possibly your (offered) medicine is a way to spread the virus more,” Khamenei said. “Or if you send therapists and doctors, maybe he wants to see the effect of the poison, since it is said that part of the virus is built for Iran.”

There is no scientific proof offered anywhere in the world to support Khamenei’s comments. However, it comes after Chinese government spokesman Lijian Zhao tweeted earlier this month that it “might be US army who brought the epidemic to Wuhan. Be transparent! Make public your data! US owe(s) us an explanation!” He offered no evidence to support his claim.

Wuhan is the Chinese city where the first cases of the disease were detected in December. In recent days, the Trump administration has increasingly referred to the virus as the “Chinese” or “Wuhan” virus, while the World Health Organization used the term COVID-19 to describe the illness the virus causes.

For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia. The vast majority of people recover from the new virus.

Khamenei made the comments in a speech in Tehran broadcast live Sunday across Iran marking Nowruz, the Persian New Year. He had called off his usual speech at Imam Reza shrine in Mashhad over the virus outbreak.

His comments come as Iran has over 20,600 confirmed cases of the new coronavirus amid 1,556 reported deaths.

Iran is one of the hardest-hit countries in the world by the new virus. Across the Mideast, Iran represents eight of 10 cases of the virus and those leaving the Islamic Republic have carried the virus to other countries.