DUBAI, United Arab Emirates (AP) — Iran’s underground Natanz nuclear facility lost power Sunday just hours after starting up new advanced centrifuges capable of enriching uranium faster, the latest incident to strike the site amid negotiations over the tattered atomic accord with world powers.

As Iranian officials investigated the outage, many Israeli media outlets offered the similar assessment that a cyberattack darkened Natanz and damaged a facility that is home to sensitive centrifuges.

Power at Natanz had been cut across the facility comprised of above-ground workshops and underground enrichment halls, civilian nuclear program spokesman Behrouz Kamalvandi told Iranian state television.

The Vienna-based International Atomic Energy Agency, which monitors Iran’s program, said it was “aware of the media reports,” but declined to comment.

It became a flashpoint for Western fears about Iran’s nuclear program in 2002, when satellite photos showed Iran building its underground centrifuges facility at the site, some 200 kilometers (125 miles) south of the capital, Tehran.

Iran also blamed Israel for the killing of a scientist who began the country’s military nuclear program decades earlier.

The Stuxnet computer virus, discovered in 2010 and widely believed to be a joint U.S.-Israeli creation, once disrupted and destroyed Iranian centrifuges at Natanz.

The nuclear deal limited Iran to using only IR-1s for enrichment.

Since then-President Donald Trump’s withdrawal from the Iran nuclear deal in 2018, Tehran has abandoned all the limits of its uranium stockpile.

On Tuesday, an Iranian cargo ship said to serve as a floating base for Iran’s paramilitary Revolutionary Guard forces off the coast of Yemen was struck by an explosion, likely from a limpet mine