This photo taken from a video of a CCTV camera shoes a person in black clothes, center, destroying display cases with jewels inside theGreen Vault in Dresden, Germany, early Monday Nov. 25, 2019. Thieves broke into Dresden’s Green Vault early Monday morning, making off with three sets of jewelry from the 18th century that German officials said would be impossible to sell on the open market. (Police Saxony/dpa via AP)

BERLIN (AP) — German authorities are offering a 500,000-euro ($550,000) reward for information leading to the recovery of 18th century jewels snatched from a unique collection in Dresden or the arrest of the thieves.

A large diamond brooch, a diamond epaulette and other treasures were taken from Dresden’s Green Vault early Monday morning.

Police and prosecutors said in a joint statement Thursday that “we will leave no stone unturned to solve this case.”

A 40-member investigating commission is working on the robbery.

The Green Vault is one of the world’s oldest museums. It was established in 1723 and contains the treasury of Augustus the Strong of Saxony, comprising around 4,000 objects of gold, precious stones and other materials.

People walk in front of the Residenzschloss, Residence Palace, a day after thieves broke into the Green Vault at the building, one of the world’s oldest museums, in Dresden, Germany, Tuesday, Nov. 26, 2019. (Sebastian Kahnert/dpa via AP)
Media reports in front of the Residenzschloss, Residence Palace, a day after thieves broke into the Green Vault inside the building, one of the world’s oldest museums, in Dresden, Germany, Tuesday, Nov. 26, 2019. (Sebastian Kahnert/dpa via AP)
This undated photo provide by the State Art Collection in Dresden on Monday, Nov. 25, 2019, shows an Epaulette of the Diamond Rose set that were stolen from the Green Vault early Monday, Nov. 25, 2019 morning in Dresden, Germany. (Staatliche Kunstsammlungen Dresden/Juergen Karpinski via AP)