Oskar Kokoschka's "Portrait of Tilla Durieux" (1910) Museum Ludwig/Marcus Stroetzel via Bloomberg

“Portrait of Tilla Durieux” (1910) has been in the Museum Ludwig in Cologne since 1976. Flechtheim’s great-nephew Mike Hulton, a medical doctor based in California, filed a claim for the painting’s restitution in 2008, saying the dealer sold it under duress and didn’t get a fair price. The museum said Flechtheim was already in financial trouble before the Nazis came to power and sold the painting to pay off debts. 

“The view of the advisory commission is that this case cannot be exhaustively clarified,” the panel, led by former constitutional judge Jutta Limbach, said in a statement. “Because of an absence of concrete evidence, it is to be assumed that Alfred Flechtheim was forced to sell the disputed painting because he was persecuted.”

Francisco Goya's Witches in Air, 1798 Museo del Prado, Madrid, Spain

Three bare-chested characters wearing dunce caps hold a fourth, nude character in the air while another lies on the floor, covering his ears, A sixth figure flees, his head covered with a white cloth. With his hand, he makes the gesture intended to protect him from the evil eye. At the right of the scene, a donkey stands out against the neutral background.

Federal investigators have concluded that thieves armed with detailed shipping information were behind the removal of a Goya painting from a truck en route to the Solomon R. Guggenheim Museum from Ohio last week, law enforcement officials said Friday. 

The 1778 painting, “Children With a Cart,” was packed inside several nested crates aboard a locked unmarked truck used by a professional art transporter. The crated painting was removed from an outer shipping container in the truck while it was parked at a Howard Johnson Inn near Bartonsville, Pa. 

The two drivers checked into the hotel around 11 p.m. on Nov. 7, according to the motel manager, Faizal Bhimani. He said the white midsize truck was left in an unlighted parking lot adjacent to the hotel, out of sight of the hotel’s rooms and the main office. 

When the drivers returned to the truck at about 6:30 a.m. on Nov. 8, the locks had been broken and the painting, insured for $1 million, was gone, law enforcement officials said, speaking on condition of anonymity.

Robert K. Wittman, former head of the FBI's Art Crime team and now a security consultant in Philadelphia, notes that history's most infamous art thefts, including the 1990 Isabella Steward Gardner Museum heist in Boston, targeted works hanging on walls, not in transit. But he adds that art on the move is at its most vulnerable. 

Mr. Wittman helped recover a 1778 Goya masterpiece stolen off a truck in Pennsylvania in 2006 en route from the Toledo Museum of Art in Ohio to the Guggenheim in New York. In that case, its two drivers made the dumb decision to check into a motel for a nap. They returned to find their parked truck busted open and the unmarked Goya crate gone. The thief didn't know what he had, and said he wanted to get rid of it. He didn't destroy the painting because "it kind of grew on me." He had a lawyer contact authorities saying he had found it in his basement—there was a $50,000 reward—but wound up pleading guilty and being sentenced to five years in prison.

The main demand of the strikers, all employees of the Culture Ministry, is that they want the Government to hire more people and create at least 1,000 new jobs. They particularly want more security guards, whose numbers, the strikers contend, have not swelled to match the ever-growing stream of visitors. Strikers also demand that the Government end the system of hiring people on temporary contracts and instead offer permanent jobs.

On Friday, hundreds of frustrated tourists milled around near I. M. Pei's glass pyramid that gives access to the Louvre. Instead of a ticket to the museum, visitors got pamphlets from striking workers, explaining their grievances. They did not get much sympathy. A family from Sydney, Australia, said that seeing the Louvre's great collections from ancient Egypt and Greece would have been the highlight of their trip to Paris.

Paris' Louvre at night (Photo by CR Sezgin)

Due to exceptional circumstances, the Louvre museum is currently closed. We apologize for the inconvenience and will keep you informed when the museum opens again.

PARIS –The Louvre museum was shut on Wednesday after 200 guards and surveillance agents went on strike to protest the growing number of often violent pickpockets who prey on them and tourists. 

“For more than a year, pickpockets have come here every day,” Thierry Choquet, a member of the main union at the Louvre, said. “They threaten guards by telling them that they know where they live.” 

The pickpockets are often minors from Eastern and Central Europe, Mr. Choquet said, who “buy entry tickets, threaten agents and attack tourists.” 

On Wednesday the museum’s management said that it would beef up security forces at the Louvre, which usually attracts between 25,000 and 30,000 visitors a day at this time of year.

The museum said in a statement that pickpocketing was a growing problem despite measures taken last year, including tighter co-operation with the police and temporary bans on people already identified as pickpockets from re-entering the museum. Late last year, the Louvre filed an official complaint to the state prosecutor over visitors falling victim to the thieves.

Picasso's "Woman in an Armchair" owned by Leonard Lauder  is one of 78 works donated to the Met

The trove of signature works, which includes 33 Picassos, 17 Braques, 14 Légers and 14 works by Gris, is valued at more than $1 billion. It puts Mr. Lauder, who for years has been one of the city’s most influential art patrons, in a class with cornerstone contributors to the museum like Michael C. Rockefeller, Walter Annenberg, Henry Osborne Havemeyer Robert Lehman.

The pieces may have been selected as a "theft by commission" or because it might be easier to remove the precious stones and resell these piece on the market as the Etruscan one's are well documented and these less so.

For now investigators are focusing on the the entry point downstairs, an assessment of the 50 or so staff associated with the museum's surveillance, and with reviewing tapes CCTV tapes both during the theft and in the days preceding the assault in the hopes that perhaps the assailants cased the museum in the days preceding the event passing themselves off as visitors.

Given the execution of the event, law enforcement is placing a higher focus on the statements of the various staff responsible for the museums security watch to look for irregularities or contradictions of their recollection of the events as they occurred during the theft.

There is also speculation as to if the smoke was used to possible create a diversionary fire, create a smokescreen to hide the thieves movements or to perhaps signal their pick-up at the completion of the theft.

Law enforcement are also investigating other thefts of local residences in the area to look for similarities.

A robbery over the Easter weekend at Rome's Villa Giulia Etruscan museum led to calls Tuesday for improved measures to secure Italy's culture ministry. "It took a multimillion (euro) theft to point attention to one of the longstanding problems that weigh on the management, protection and safety" of Italy's cultural sites, said Giuseppe Urbino, the national secretary of the Confsal Unsa Beni Culturali union.

Late Saturday, robbers stole dozens of rare items, including ancient jewelry. "Thefts have become routine, but never has any minister - at least in the last 20 years - tried to carry out a healthy safety policy". The union leader pointed the finger at spending cuts, following outgoing Premier Mario Monti's "spending review", which have left few resources for training, security upgrades and personnel, with many museum guards performing double shifts. "The management class at the culture ministry has demonstrated incompetence, and it is also for this reason that something must change in order to help culture in our 'bel paese' rise again," Urbino said.

The thieves gained entry after forcing open one of the entrance doors. They smashed two cabinets on the upper floor containing items from the important Castellani collection comprising more than 6,000 whole and fragmented artefacts including ancient and modern gold, and amber pendants dating from the early 7th century BC. 

However this activated the alarm system and before fleeing the thieves only stole some 19th-century jewelry, not among the museum's most valuable items.

Investigators believe that the thieves visited the museum before the robbery, possibly posing as tourists.

Commissioned to illustrate a Bible for the Catholic Press in the mid-1950s, Stahl painted the 14 Stations of the Cross. Later, he decided to paint larger versions, along with a 15th painting, "The Resurrection," because he wanted his work to end on a positive note. All 15 paintings were 6 feet by 9 feet, and painted in oil. In 1965, Stahl and his wife moved to Sarasota and decided to open a museum for the large-scale paintings. Called "The Museum of the Cross," it was one of the main tourist attractions in the area at the time.

One witness remembered seeing a white van near the museum that night, while Stahl recalled two visitors from South America who asked odd questions in the days prior to the theft. The trail eventually went cold, and Stahl and his family didn't think investigators were trying as hard as they could.

"It was devastating," said Regina Briskey, Ben Stahl's daughter, who was working at the museum at the time. "It was incomprehensible, because at that time in Sarasota, there was hardly any crime."

The artist's son, David Stahl, wrote on a website that he even contacted witnesses and possible informers around Florida, but claimed authorities didn't pay attention.

McGath -- who is also investigating the cold case of a quadruple murder in 1959 in Sarasota and its possible link to the "In Cold Blood" killers in Kansas -- said she is poring over records. She wants to talk to anyone who might have information about the Stahl art heist. 

Interpol Washington is also involved. Spokeswoman Nicole Navas said this week that officials recently sent out a message to all 190 Interpol member countries in an attempt to renew interest in the case, which she said is one of 500 open art heist cases being investigated by the agency.