A gunman opened fire in the lobby of Liberation, a prominent French daily in Paris, on Monday gravely wounding a photographer’s assistant before fleeing.

The shooting at the office came three days after a shooting at the BFM-TV news network in Paris that is still under investigation.

Police and representatives of Liberation say a 27-year-old photographer’s assistant is in serious condition after being shot in the chest and arm.

Witnesses reported the gunman said nothing during the brief time he was in the lobby Monday morning. Yoann Maras of the police Union Alliance said the gunman fired a pump-action rifle.

Less than two hours after the shooting, three shots were fired in front of the headquarters of Bank Societe Generale in the Paris suburb of La
Defense, according to the police.

And very soon after that, a man called police to say he had been taken hostage by a gunman in the town of Puteaux, next door to La Defense. Police said the gunman forced his hostage to drive six kilometers back toward central Paris, and then let him go on the Champs-Elysees, a chic and busy shopping thoroughfare.

The Paris police headquarters said that it is not clear whether the three incidents are linked, but that authorities are increasing security in all three places as well as media offices around Paris.

As police hunt for the attacker(s), a helicopter flew over the neighborhood that includes the French president’s office and the nearby Champs-Elysees avenue.

President Francois Hollande, said in a statement that he had ordered authorities to “mobilize all means to clarify the circumstances of these acts and arrest the perpetrator or perpetrators.”

The motivation behind all three attacks remains unclear.