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.

Israel's Netanyahu appears in court after pardon request backed by Trump
Hong Kong arrests more suspects in fire probe as death toll hits 151
UK lawmaker Tulip Siddiq handed jail sentence in absentia in Bangladesh graft case
Southeast Asia storm deaths near 700 as scale of disaster revealed
Trump confirms conversation with Venezuela's Maduro
