Paris is being attacked by terrorists in at least three separate locations on Friday, killing more than 20 people.

The first known attack was allegedly on a restaurant, Petit Cambodge, in Paris's 10th arrondissement on Friday night. Another incident reportedly occurred at the Bataclan, where as many as 60 people are said to be held hostage after a performance by American rock band Eagles of Death Metal.

Police say the gunmen—as many as six—were armed with kalashnikovs and grenades. They are all currently on the loose.

Other unconfirmed reports indicate several explosions were detonated outside the Stade de France, just north of the city, where there was a match between France and Germany. President François Hollande was reportedly in attendance at the match. Three people were reportedly killed at the stadium incident.

And there is a heavy police presence outside several restaurants near the Opéra metro stop in the 9th arrondissement.