French officials say Iran's ministry of intelligence was behind a plot to bomb a rally of Iranian opposition groups in Paris in June.
In a statement, the French government said it had frozen the assets of two senior Iranian officials.
Iran insists the alleged plot is a fabrication, but has called for talks.
In a possibly linked development on Tuesday, police in the French city of Dunkirk raided a Shia Muslim centre that has close ties to Iran.
They made several arrests and froze the assets of the group.
What is the background?
On 30 June, Iranian opposition supporters gathered in Paris for a meeting of the National Council of Resistance of Iran (NCRI). Guests included US politicians Newt Gingrich, a former House speaker, and Rudy Giuliani, President Donald Trump's lawyer.
The NCRI is considered to be the political arm of dissident group Mujahideen-e-Khalq (MEK), which Iran has designated as a terrorist organisation.
That title... france upset cos iran got in the way of them blowing people up