Two thieves have broken into a museum in the northern Serbian city Novi Sad, stealing four valuable paintings, including works by Rembrandt and Rubens.

Police say the masked robbers entered the City Museum early Sunday morning and tied up the guards. The stolen pieces include Rembrandt Van Rijn's Portrait of Father, Peter Paul Rubens' Seneca, a miniature by Italian baroque painter Pier Francesco Mola and another oil painting by an anonymous 16th-century Dutch painter.

The paintings are believed to be worth millions of dollars.

Police were investigating the possibility that the theft of the artwork was commissioned from abroad.

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