Police have now sealed off the area around Liberation's offices
A gunman has opened fire inside an office building in Paris housing the left-wing newspaper, Liberation, leaving one man seriously injured.
The victim was a photographer's assistant, aged 27, Liberation said.
On Friday a man armed with what appeared to be a gun broke into the Paris offices of the rolling news channel BFMTV. He did not fire any shots and no-one was injured.
It is not clear whether there is any connection between the two incidents.
On its website, Liberation said the man entered the premises shortly before 10:15 (09:15 GMT), armed with a hunting rifle. He fired two shots, wounding the photographer's assistant before escaping.
The gunman did not say anything, Liberation reported.
The victim's condition was described by the newspaper as serious.
Police have sealed off the area around Liberation's offices.
"In a democracy, when someone enters a newspaper office with a gun, this is very, very serious, whatever the person's mental state," said Liberation's publisher Nicolas Demorand.
Mr Demorand said he would hold a news conference at 17:00 GMT.
In the next few hours, investigators will compare CCTV images from the two attacks to see if there are any similarities, BFMTV said.
A journalist from Liberation told BFMTV that the two security guards at the entrance immediately ducked down behind their desks when the man drew his weapon and did not see him clearly.