A manhunt has been launched in Paris after a gunman attacked offices of the newspaper Libération and opened fire outside the bank Société Générale, reports BBC News.
A photographer, 27, was seriously hurt at Libération and a motorist was forced to drive to the Champs Elysées before he was allowed to go.
Police are looking for the same man who broke into the Paris offices of the 24-hour news channel BFMTV on Friday.
Police have now been stationed outside all the main media offices in Paris.
Liberation said images of the suspect corresponded with those of the attacker at BFMTV.
A police helicopter is now hovering above the Champs Elysees, searching for the man suspected of shooting the Liberation photographer, says the BBC's Christian Fraser in Paris.
Police are encouraging people to stay inside.
French media say the hostage-taker told the motorist he was armed with grenades.
At 10:15 local time (09:15 GMT), a gunman entered the Paris offices of Libération, near the Place de la Republique in the east of the city, and opened fire.
He fired two shots from a gun, injuring a photographer in the chest and arm, before escaping.
Eyewitnesses said the gunman was aged about 40 and was wearing a cap and a raincoat. He did not say anything, Liberation reported.
Some two hours later, the bank Société Générale confirmed that a man opened fire outside its headquarters in the western business district of La Defense. No-one was injured, the bank said.
Libération's deputy editor Fabrice Tassel said the victim - who was shot in the chest - was fighting for his life.
The man - who has not been named - was said to be a freelance assistant photographer who had just arrived at the newspaper office to work on a fashion photoshoot.
Police have sealed off the area around Liberation's offices. Interior Minister Manuel Valls has visited the scene, along with Culture Minister Aurelie Filippetti and the Mayor of Paris Bertrand Delanoe.
French President François Hollande asked Mr Valls to mobilise every means to stop whoever was responsible for the attacks and to shed light on the circumstances.
Read more of this report from BBC News.