An armed man has taken a number of people hostage, according to reports, including a pregnant woman.
The police said there was no indication that the incident was terrorism-related.
Police said Tuesday they could not confirm whether the man was armed.
Witnesses said the man claimed to be in possession of a gun and bomb.
At least one man was lightly injured while fighting with the hostage-taker and escaping before the BRI officers arrived on the scene, a police source said.
French police have cordoned off the area and confirmed there was a "police intervention" underway in Rue des Petites Ecuries in the 10th arrondissement of the French capital, CNN reports.
The suspect was reportedly holding a letter he wants to be handed over to the Iranian ambassador.