Two works by the American artist Andy Warhol were stolen from a gallery in the Netherlands.
The burglary took place in the MPV gallery in the province of North Brabant.
Thieves took four works from Warhol's series reigning queens, but they left two nearby, the owner of the gallery told Dutch television NOS.
The portraits were stolen of the late British Queen Elizabeth the Second and Margaret the Second, who was Queen of Denmark until she abdicated earlier this year.
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The police said that the thieves used some kind of explosives and that a lot of damage was caused to the gallery and the surrounding buildings.
According to NOS, two other paintings from the series, portraits of Queen Beatrix of the Netherlands and Queen Ntombi Tfwala of Eswatnia, formerly Swaziland, the thieves left because they could not fit in the car they used to escape.
The four artworks were stored at the gallery ahead of the PAN Amsterdam art fair later this month, where they were to be sold as a set.
They are part of a series of 16 works on silk of four queens that Warhol, one of the most important artists of the 20th century, made in 1985 - two years before his death.
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