French Prime Minister Jean Castex said on Friday that four people were injured, including two seriously, in a knife attack that took place near the former office of satirical magazine Charlie Hebdo.
A security cordon was set up around the office, a police source also said.
French media BFM TV and Le Figaro said a suspect has been arrested on the steps of the Paris Bastille opera house.

Bangkok pub fire kills 27, police investigating possible negligence
US completes another round of strikes on Iran as it targets Gulf states
Heavy floods submerge roads, vehicles in northern China
France sends water bombers to tackle wildfire outside Paris
Traffic accident in Mexico leaves 9 dead, 10 injured
