A painting by Belgian artist Rene Magritte was stolen from a Brussels museum in broad daylight, police said Thursday.

Two unidentified people — one of them armed — took the 1948 nude portrait, entitled "Olympia," from the gallery dedicated to the Belgian surrealist's life and works.

The oil painting of the surrealist's wife, Georgette, is valued at $1.1 million.

The painting hung at Magritte's former house which has been turned into a small museum. Entry is by appointment only. It is separate from a larger Magritte museum that opened this year.

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The Associated Press contributed to this report.