Thieves broke into the Louvre museum in Paris on Sunday, using a crane and smashing an upstairs window to steal “priceless” jewelry from an area that houses the French crown jewels before escaping on motorbikes, the French government said.

The robbery is likely to raise awkward questions about security at the museum, where officials had already sounded the alarm about a lack of investment at the world-famous site, home to such artworks as the Mona Lisa. The Louvre welcomed 8.7 million visitors in 2024.

The thieves struck at about 9.30 a.m. local time, when the museum had already opened its doors to the public, and entered the Galerie d’Apollon wing, the Interior Ministry said in a statement.

A man in a white suit and mask looks through a broken window.A forensics team member inspects a window believed to have been used in a robbery at the Louvre museum on Sunday. The French government says priceless jewelry was stolen. (Gonzalo Fuentes/Reuters)Robbery was ‘very professional’ with no violence

The robbery took about four minutes, Culture Minister Rachida Dati told TF1, and was carried out by professionals.

“We saw some footage: They don’t target people, they enter calmly in four minutes, smash display cases, take their loot and leave. No violence, very professional,” Dati said, adding that no injuries were reported.

One piece of jewelry was recovered outside the museum, she said, apparently dropped as the thieves made their escape. Dati declined to say what the item was, but newspaper Le Parisien said it was believed to be the crown of Napoleon III’s wife, Empress Eugénie. The item was broken, the newspaper said.

“It’s worth several tens of millions of euros — just this crown. And it’s not, in my opinion, the most important item,” Drouot auction house president Alexandre Giquello told Reuters.

“Ideally, the perpetrators would realize the gravity of their crime and the dimension they’ve entered into, and return the items, since the jewels are completely unsellable,” he said.

“We’re touching on the history of France…. It’s a completely incomprehensible act, because the perpetrators will have every police force in the world on their tail, and in my opinion, they’ve put themselves in a very precarious situation.”

Probe underway by specialist unit

Interior Minister Laurent Nuñez told France Inter that three or four thieves got into the museum from outside using a crane positioned on a truck.

“They broke a window, headed to several display cases and stole jewels … which have a real historical, priceless value,” he said, adding that the team likely scouted the location and may have carried out similar thefts in the past.

A video posted on social media platform X by a museum guide showed visitors filing toward exits in the middle of their tour, initially unaware of the reason for the disruption.

Nuñez said a probe had been opened, with a specialized police unit that has a high success rate in cracking high-profile robberies such as this one tasked with running it.

Police officers stand around a small crane leading to a tall window on the second floor of an ornate old building.Police officers work next to a crane under a window at the Louvre after Sunday’s jewelry robbery. Interior Minister Laurent Nuñez said three or four thieves got into the museum from outside using a crane positioned on a truck. (Gonzalo Fuentes/Reuters)Questions on security

The Louvre, the world’s most-visited museum, said on X it would remain closed for the day for “exceptional reasons.”

Joan and Jim Carpenter, visiting Paris from Santa Cruz, Calif., said they had been moved out of a gallery just as they were about to see the Mona Lisa.

“Well, when you rob the Louvre, that’s a big deal to all of France, so I knew something was up because of the way they swept the whole museum,” Joan Carpenter said.

The Mona Lisa, by artist Leonardo da Vinci, was stolen from the museum in 1911 in one of the most daring art thefts in history. A former employee who carried out the heist was eventually caught, and the painting was returned to the museum two years later.

Earlier this year, officials at the Louvre requested urgent help from the French government to restore and renovate the museum’s aging exhibition halls and better protect its countless works of art.

“For 40 years, there was little focus on securing these major museums, and two years ago, the president of the Louvre requested a security audit from the police prefect. Why? Because museums must adapt to new forms of crime,” Dati, France’s culture minister, said. “Today, it’s organized crime — professionals.”