State television showed a passport-style photograph of the suspect it identified as Reza Karimi, a 43-year-old man, saying he fled the country before the sabotage happened.
Since January, Iran has begun enriching uranium at up to 20 percent purity, a technical step away from weapons-grade levels.
Diplomats belonging to major powers met separately with Iran and the US to discuss how to bring both back into compliance with the 2015 nuclear deal that Washington abandoned three years ago.
Tehran’s move is the latest of many taken to raise pressure on US President Joe Biden as the two sides remain locked in a stand-off over who should move first to salvage the 2015 nuclear deal abandoned by the Trump administration.
Tehran and Beijing signed a 25-year bilateral agreement over the weekend, becoming a subject of both celebration and condemnation.
The comprehensive cooperation programme will be signed by the Iranian and Chinese foreign ministers as Tehran hardens its stance towards the JCPOA.
Iran claims to have missiles that can travel 2,000 kilometres, placing much of the Middle East, including Israel, within range.
UN Special Rapporteur on Iran calls for easing of US sanctions on Iran.
Iranian President Hassan Rouhani has criticised Europe's "inactivity on JCPOA commitments" and added that Iran is committed to "preserving the JCPOA and is the only party that has paid a price for it."
US says it's disappointed by Tehran’s rejection to join a meeting but remained ready to "re-engage in meaningful diplomacy" and would consult with the other major powers.
Iranian Foreign Minister Mohammad Javad Zarif has said the US strikes were "illegal and a violation of Syria's sovereignty" in a meeting with his visiting Iraqi counterpart Fuad Hussein.
President Joe Biden okays air strike against a structure belonging to what the US says were Iran-backed militia.
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