The suspects are three German citizens, not named, two aged 23 and one 26, arrested on suspicion of organized robbery and arson.
The police are also looking for two others, suspected of the same crimes. They were identified as Abdul Majed Remmo, 21, and Mohamed Remmo, 21.
The two are said to be a part of a family of criminals.
Cousins Ahmed Remmo and Wissam Remmo, and a friend who worked as a security guard, were convicted and sentenced to several years in prison for a theft at Berlin’s Bode museum.
It has an estimated value of $4.45 million and has yet to be recovered. Authorities believe it has been chopped up and sold.
German officials believe at least six people were directly involved in the Green Vault jewelry heist.
Four security guards employed at Dresden’s Royal Palace were under investigation
for potential involvement in the heist, a spokesperson for the Saxon Police confirmed to National Jeweler in March.
A total of 1,638 police officers from Saxony, Berlin, and other states, as well as federal special police forces, searched 18 locations, including 10 apartments and vehicles, as per a press release from the Saxon police department.
The main area of focus was the Berlin-Neukölln district as officers searched for the stolen jewelry and any possible evidence, such as clothing and tools.
None of the jewelry has yet been recovered.
SEE: The Jewelry Stolen from the Green Vault
“We'd have to have a lot of luck in order to find them a year after the crime,” said Thomas Geithner, Dresden police spokesman, to reporters.
Marion Ackermann, Dresden’s State Art Collections Director, said she was encouraged by the development.
“Of course we hope that the jewelry sets will be found and that they will soon be able to be returned to their original location,” she said.
The Green Vault is one of the world’s oldest museums, created in 1723 by Augustus the Strong of Saxony, who wanted to establish Dresden as an arts hub.
His treasury, on display in Dresden’s Royal Palace, includes 4,000 jewels, objets d’art, and other historically significant items.
Its most famous treasure is the Dresden Green Diamond
, a 41-carat green diamond, which is currently on loan to the Metropolitan Museum of Art in New York for an exhibition.