(PARIS) -- Several people disguised as construction workers broke into the world-famous Louvre Museum in Paris on Sunday, cracking open display cases and stealing jewelry that once belonged to Emperor Napoleon and his wife, officials said.
At least nine pieces of jewelry of "inestimable heritage and historical value" were taken in the brazen heist before the thieves made their getaway on motorcycles, two ministers said.
"Investigations have begun, and a precise list of the stolen items is underway," the museum said in a statement.
Four thieves pulled off the apparently well-planned heist, according to authorities.
The theft took place around 9:30 a.m. local time on Sunday, just before the museum was set to open to the public, the Paris Police Prefecture said in a statement.
The team of thieves drove up to the side of the museum in what police described as a "mobile freight elevator" equipped with a metal ladder on the back that was extended up to a window, according to the Paris police.
"They deployed the freight elevator, securing the surroundings with construction cones, before accessing the second floor, in the Apollo gallery, by breaking the window with an angle grinder," according to the police statement. "Inside, they then smashed two display cases, 'Napoleon jewels' and 'French crown jewels,' using the angle grinder and stole numerous pieces of high-value jewelry."
Two of the thieves arrived at the museum in the mobile freight elevator, one wearing a yellow vest and the other an orange vest, according to police. Two accomplices arrived at the museum at the same time on what police described as "T-max vehicles" or sports motorbikes.
"The staff on site, upon seeing what was happening, took to safety," according to the police statement. "An alarm was triggered at 9:37 a.m. The perpetrators exited through the window by going back down the freight elevator before fleeing on the two motorbikes at 9:38 a.m."
Following the heist, police found two angle grinders, a blowtorch, gasoline, gloves, a walkie-talkie, a blanket, and a crown at the scene. Police also found a yellow vest that was apparently dropped by one of the fleeing perpetrators at the corner of Pont de Sully and Avenue Henri IV, several blocks from the Louvre, police said.
French Interior Minister Laurent Nunez in an interview on local radio said the value of the items would be "inestimable."
The alleged robbery took about seven minutes, he said.
A notification posted on the Louvre's website shortly afterward said, "The Louvre Museum will remain closed today for exceptional reasons. We thank you for your understanding."
The decision to close the museum was made jointly by its management, the police and the Ministry of the Interior, museum officials said in a statement. The doors were closed as "a security measure and to preserve traces and evidence for the investigation," the statement said.
Kaci Benedetti, who was visiting Paris from the United States, told ABC News she was standing in line to enter the museum on Sunday when a commotion began. Police were running along the courtyard where Benedetti and her family were waiting, she said.
She watched as the officers attempted to enter the building through a side door, but "could not because they were locked," she said.
"We could see people inside running and some were banging on the glass doors to get out, but could not because they were locked," Benedetti said. "Then police and military police arrived. After about an hour they announced the Louvre was closed for today."
The news of the robbery came first from French Minister of Culture Rachida Dati, who said on social media, "A robbery took place this morning at the opening of the Louvre Museum."
Dati added, "No injuries to report. I am on site alongside the museum teams and the police. Investigations underway."
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