Tehran's chief nuclear negotiator Abbas Araqchi on Tuesday told state media the nation was adding centrifuges at the Natanz nuclear facility, and would begin enriching fissile material up to 60 percent purity, a level above the 20 percent threshold seen as highly enriched and a large step toward weapons-grade uranium.

"We are going to add one thousand more centrifuges to Natanz facility... we will start from tomorrow enrichment up to 60 percent."

Meeting with his Russian counterpart on Tuesday, Iran's foreign minister Javad Zarif hinted that Israel could face repercussions after an explosion on Sunday at the Natanz nuclear site.

"We will do our own investigations. If we conclude our investigations and Israel turns out to be responsible, then Israel will receive its response and it will see what idiocy it has committed. Rest assured that Iran's position after this action will be stronger both in the negotiations and in nuclear future."

On Monday, Israeli Prime Minister Benjamin Netanyahu didn't comment on the alleged sabotage but said Jerusalem would do everything in its power to stop Tehran from developing atomic weapons.

"I will never allow Iran to obtain the nuclear capability to carry out its genocidal goal of eliminating Israel."

Iran's plan to up enrichment comes shortly before high-level talks in Vienna are set to resume, aimed at reviving a multinational 2015 nuclear deal that limited Iran's enrichment program in exchange for sanctions relief.

Last week, Iran and the global powers held what they described as "constructive" talks to salvage the deal that all but collapsed after former president Donald Trump quit the pact, reimposed sanctions, and Iran breached limits on uranium enrichment.

U.S. President Joe Biden has said Tehran must resume full compliance with restrictions on its nuclear activity under the deal before Washington can rejoin the pact.