The 1972 Montreal Museum of Fine Arts robbery, sometimes called the Skylight Caper, took place very early in the morning of September 4 of that year. Three armed robbers used a skylight under repair to gain entry to the museum from its roof, tied up the three guards on duty, and left on foot with 18 paintings, including a rare Rembrandt landscape and works by Jan Brueghel the Elder, Corot, Delacroix, Rubens, and Thomas Gainsborough, as well as some figurines and jewellery. One of the Brueghels was returned by the thieves as an initiative to start ransom negotiations. None of the other paintings has ever been recovered and the robbers have never been arrested or even publicly identified, although there is at least one informal suspect.