A man carrying a grenade and an explosive vest entered Iran's consulate in Paris, leading to a police arrest and a cordoned-off area.
Witnesses saw the incident at around 11 am (0900 GMT), prompting a public request to avoid the area and a temporary metro line interruption for security reasons.
Police provided no further details.
On Friday, explosions were reported in the Iranian city of Isfahan, which sources attributed to an Israeli attack.
However, the Iranian government downplayed the incident and did not indicate any plans for retaliation.
When Reuters contacted the Iranian embassy for information, they declined to provide any details and it was unclear if the incident was related to the ongoing tensions between Iran and Israel.