Four Romanians behind a spectacular art heist in the Netherlands were ordered Monday to pay 18 million euros, with the fate of the stolen masterpieces by Picasso, Monet, Gauguin and Lucien Freud still a mystery.

Seven paintings that were temporarily on display at the Kunsthal Museum in Rotterdam were stolen in 2012 in a raid that lasted only three minutes, in what the Dutch media called "the theft of the century."

A court in the Romanian capital ordered the heist's mastermind Radu Dogaru, his mother Olga, Eugen Darie and Adrian Procop to reimburse the paintings' insurers.