A street in the French captial has been closed off as police cordon the area.
A pregnant woman is reportedly being held captive along with possibly two other people in Paris, according to Daily Mail.
A man claiming to be armed with a bomb and revolver has taken three people hostage in Paris, police have said. Special units and fire services were at the scene.
The hostage-taker reportedly entered the building in Rue des Petites Ecuries, pretending to be a food-delivery courier, at around 4pm local time. The attacker, who appeared to be brandishing a fake weapon, had doused his remaining two hostages in petrol, the source said.
Police initially said the hostage scene was unfolding in an office in the building, but soon stopped communicating details to journalists.
Officials at police headquarters would not immediately confirm whether the person holding the hostages was armed or describe the nature of his demands. An Interior Ministry official said negotiations with the suspect were taking place.