A manhunt for two attackers was launched after four people were stabbed to death near Charlie Hebdo’s old office in Paris.
According to an investigation source, two of the victims are “extremely bad” after the attacks at around 11:50 a.m.
He added, “Two attackers have been seen running away and they are being wanted. A suspicious device has also been discovered.”
A man with blood on his clothes was arrested at around 12:45 p.m. at an opera house in the French capital.
French police sources said one of the suspects was arrested while nearby school children were ordered to stay inside.
One of the attackers is said to have fled by subway, reports Le Figaro.
Police said there was “extreme concern” today that those responsible for the knife wounds might strike again.
A perimeter was also set up near the old Charlie Hebdo office due to a “suspicious package” in the area.
There is a trial taking place in the French capital dealing with the January 2015 attacks that shocked the world.
Charlie Hebdo opened the criminal case by republishing cartoons mocking the Prophet Mohammed.
Local schools have closed and people are advised to stay in their offices and at home.
The 2015 Paris attacks involved three armed men connected to al-Qaeda and the Islamic State, who traveled through Paris to kill 15 civilians and two policemen on duty at will.
Her main targets were employees of Charlie Hebdo, the satirical magazine that had published a number of cartoons mocking the Prophet Muhammad.
The main terrorists, all known to the French security services, were all shot by the police themselves, but 14 defendants in the current trial faced life in prison for “complicity in terrorism”.
Paris-born brothers Said and Cherif Kouachi attacked Charlie Hebdo’s office and murdered 12 people using Kalashnikovs before escaping in a stolen car in 2015.
Charlie Hebdo is now publishing from a secret address in Paris, and many employees have bodyguards.