French authorities continue to make arrests as they work to track down thieves who made off with more than $100 million worth of precious jewels from the Louvre in a brazen heist in broad daylight.

Paris prosecutors announced two more people have been charged in the theft at the Louvre Museum last month, bringing the total number of suspects charged in the heist to four.

French media had speculated that the suspects, who include the girlfriend of one of the suspected thieves, were amateurs because they dropped the most precious of the jewels, Empress Eugenie’s crown,...