At least four people have been injured after a Molotov cocktail was thrown into a restaurant in a Paris suburb, according to reports.

Three people were airlifted to hospital with serious burns and a fourth had minor injuries, according to AFP news wire.

French newspaper Le Figaro said that it was possible that other victims remained inside the restaurant in the north-eastern suburb of Aubervilliers.

Heavy smoke remained inside the building, hampering efforts to search it, the paper reported.