(Bloomberg) –Thieves made off with jewelry and artifacts worth a reported $1.1 billion after an early-morning burglary at a German museum.

The robbers stole three sets of jewelry from Dresden’s Grunes Gewolbe — or Green Vault — after entering through a window just before 5 a.m. local time Monday, Joerg Kubiessa, the head of Dresden’s police, told reporters. The thieves escaped and remain at large.

Heute morgen gab es einen Einbruch in das historische Museum #GrünesGewölbe in #Dresden. Aktuell ist unsere Tatortgruppe des #LKA im Einsatz und untersucht den Tatort. Aussagen zum Stehlschaden sind noch nicht möglich. Im Laufe des Tages folgen weitere Informationen. pic.twitter.com/M9Lk6STjPz

— Polizei Sachsen (@PolizeiSachsen) November 25, 2019

Germany has had its share of heists in recent years. In 2017, burglars stole a 100-kilogram (220-pound) solid gold coin worth $4 million from Berlin’s Bode Museum. The coin, which is as big as a car tire, is still missing.

The Grunes Gewolbe held 3,000 individual objects, including jewels and objects made of gold, crystal and diamonds collected by Augustus the Strong, a 17th-century ruler of the kingdom of Saxony, which included Dresden.

The stolen jewelry is “unique in Europe,” said Dirk Syndram, the director of the Grunes Gewolbe. “It’s a world cultural heritage.”

They include ensembles of diamonds that are of “priceless art-historic value,” said Marion Ackermann, the head of Dresden’s state art collection. She declined to give a financial value, saying that it was impossible to estimate.

Germany’s Bild newspaper reported that the antique jewelry was worth about 1 billion euros ($1.1 billion) without saying where it got the estimate.

After $1 Billion Theft, German Museum Finds It Has No Insurance

A day after burglars made off with priceless jewels from a German museum, pressure is growing on police to find the culprits. One big reason: The diamond-encrusted dagger, pearl necklace, and dozens of other glittering artifacts—estimated to be worth more than $1 billion by the local press—were uninsured.

The German state of Saxony, the owner of the Green Vault museum in the eastern city of Dresden, carried no insurance on the jewels, standard practice because the premiums typically exceed potential damages in the long-term, the state Finance Ministry said Tuesday.

Zwischenzeitlich hat die Polizeidirektion #Dresden auch Bilder zu einem Teil der gestohlenen Schmuckstücke aus dem Museum #GrünesGewölbe veröffentlicht: https://t.co/b6a1Lcx1EY pic.twitter.com/jpwrseePuD

— Polizei Sachsen (@PolizeiSachsen) November 25, 2019

While public museums usually insure works of art that are loaned to other institutions, they often don’t take out policies on their permanent collections, according to Julia Ries, head of fine art and jewelry at insurer Ergo Group AG.

“The budgets of public museums are limited,” Ries said. “You can’t replace such a collection from a monetary or art-historic value. If the jewels aren’t recovered, this part of the collection will be lost forever.”

The insurance shortfall was revealed as more details of the theft became clear. Police believe the burglars set a fire nearby to create a power outage, then broke a window to enter the museum. Though the total number of culprits is unknown, two people quickly smashed a display case, snatched the loot, and fled.

The whole thing took “just a few minutes,” police said.

Here’s how the robbery went down early Monday:

Shortly before 5 am: Streetlights in the area go dark after someone sets fire to an electrical junction box.

About the same time: Thieves cut through a metal grate covering a window and break the glass to enter the museum.

4:57-4:58 am: Two people enter the Green Vault’s jewelry room. One, wearing a headlamp, shatters the display case with an ax to remove the gems.

4:59 am: The two security officers on duty spot the burglars on camera and call the cops.

5:04 am: Police arrive at the scene, but there’s no trace of the thieves.

5:09 am: Sixteen police cars are dispatched throughout Dresden to look for the getaway car — believed to be an Audi A6 sedan.

Around 5:15 am: Police are notified that an Audi A6 is burning in a nearby underground garage.

Monday morning: After the fire is extinguished, Dresden police search the museum and garage for further clues, but haven’t apprehended the criminals.

Bild, a daily tabloid, reported that the jewels are worth about 1 billion euros ($1.1 billion), without saying where it got the estimate. Museum officials have said the collection includes unique ensembles of diamonds that are of priceless art-historic value, declining to give a financial value.

Even as the scale of the loss became clear, some good news emerged: The thieves weren’t able to rip out all of the jewelry, some of which was sewn onto fabric lining the display cases. And one of the museum’s best-known treasures, the 41-carat Dresden Green Diamond, is on loan to New York’s Metropolitan Museum of Art.