Operation Waistcoat
Buehrle collection director Lukas Gloor (R) points to the impressionist masterpieces "Ludovic Lepic and his Daughters" by Edgar Degas (R) and "Boy in a Red Waistcoat" by Paul Cezanne during a news conference at the Kunsthaus in Zurich April 27, 2012. Police in Serbia recovered the Impressionist masterpieces by Cezanne and Degas that where stolen at gunpoint in one of the world's biggest art heists four years ago. REUTERS

One of four paintings stolen at gunpoint from a Swiss museum four years ago in a stunning art heist has been returned to Zurich, the city's senior public prosecutor said on Friday, meaning all the paintings have now been recovered.

The painting by Edgar Degas, regarded as one of the founders of Impressionism, was returned several months ago, but the information was withheld to avoid compromising investigations while Swiss and Serbian police were still hunting a painting by Paul Cezanne, still missing at the time.

Serbian police recovered this last painting, Paul Cezanne's Boy in a Red Waistcoat earlier in April. Worth a reported $109 million, the Cezanne masterpiece was the best known painting in the estimated $163 million robbery.

Two of the stolen paintings, a 1879 Monet and a 1890 Van Gogh, had been found just a week after the theft when police discovered the getaway car in the car park of a Zurich psychiatric hospital.

Due to a trace found in the getaway vehicle, investigations led to a person in Serbia who had already committed offences in Switzerland in the past, the Zurich state prosecutor's office said at a press conference.

The nature of the offences and the modus operandi, as well as potential accomplices suggested that the perpetrators were very dangerous criminals.

The Swiss and Serbian authorities then launched a vast operation codenamed Waistcoat, involving up to 30 investigators from six countries with a whole network of undercover agents monitoring phones and tracking movements.

A total of 2.8 million euros ($3.7 million) were handed over to lure the thieves in a sting operation.

Four men were arrested in Serbia in connection with the theft, the Zurich state prosecutor's office said. According to Swiss tabloid Blick, one of the four had been a contestant on Serbia's version of Who wants to be a Millionaire where he had pocketed 80,000 Serbian dinars ($940).

At a press conference in Belgrade, Miljko Radisavljevic, the special prosecutor for organized crime, said the suspects wanted to sell the painting, found in the door panel of a car, for as little as 3.5 million euros.

DAMAGE LIMITATION

Degas' 1871 work Ludovic Lepic and his daughter, worth around 10 million Swiss francs ($11 million) was damaged around the edges while in the hands of the robbers.

The thieves tried to cut the canvas from the frame, said Lukas Gloor, director of the Collection E.G Buerhle, at a press conference held in Zurich under close police surveillance, adding that they stopped before doing irreparable damage. The thieves instead removed the nails holding the paintings to their frames, Gloor said.

Gloor said when he first saw the extent of the damage to the Degas, an impressionist master best known for his depiction of ballet dancers, he had been quite worried for Paul Cezanne's as yet unrecovered Boy in a Red Waistcoat.

But that painting was found in much better condition, he said.

In the lower left corner, a part of the pigments the size of dime is gone. But that's almost all that happened to that canvas, Gloor told Reuters.

Last October, Serbian police recovered two paintings by Pablo Picasso - Horse's Head and Glass and Pitcher - stolen in 2008 from a gallery in the Swiss town of Pfaeffikon, near Zurich.