Iran on Saturday named a man that intelligence authorities allege was responsible for a recent explosion and power outage at the Natanz nuclear plant, as talks got underway in Vienna to try to save Tehran's 2015 nuclear deal with world powers.

"Reza Karimi, the perpetrator of this sabotage has been identified" by Iran's intelligence ministry, state TV said. It said the suspect had fled Iran before last Sunday's blast that the Islamic Republic has blamed on arch-foe Israel.

The television showed what it said was a photograph of the suspected perpetrator on a red card that had "Interpol Wanted" written on it. The card listed his age as 43.

"Necessary steps are underway for his arrest and return to the country through legal channels," the report added.

Israeli media outlets have quoted unnamed intelligence sources as saying the country's Mossad spy service carried out the Natanz sabotage operation. Israel has not formally commented on the incident.

The Natanz attack and Iran's subsequent announcement of producing 60 percent-enriched uranium are said to potentially complicate the Vienna talks, which were held to try to rescue the 2015 deal abandoned by Washington three years ago. 

Though the talks have reportedly made progress, Iran's chief negotiator Abbas Araqchi was reported to say that the path ahead is not an easy one and there are some serious disagreements.

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Vienna talks: U.S., Iran clash on sanctions with more talks in coming weeks

A source, echoing Iran's Supreme Leader Ayatollah Ali Khamenei's stance, reiterated Iran's demand for the removal of all sanctions imposed under former U.S. President Donald Trump.

"In Tehran, nothing will be accepted but the removal of all sanctions, including those related to the JCPOA (nuclear accord), reimposed and relabeled during the Trump era," the unnamed source told Iran's state-run Press TV.

The United States has shown it is willing to lift some sanctions inconsistent with the nuclear deal, but President Joe Biden said on Friday that Iran's plan to enrich uranium to 60 percent was not helpful as both countries hold indirect talks on Tehran's nuclear program.

(With input from Reuters)