Hours before the sun rose over the Netherlands, the group crowded around the large external door, appearing to pry it open. Seconds later, the grainy security video appeared to show a powerful explosion, sending plumes of smoke and sparks into the air, and the thieves rush into the museum in the north-eastern city of Assen.
Minutes later they were gone. But the mystery of what exactly took place during their few minutes in the Drents Museum – and what came afterwards – has left officials in the Netherlands scrambling for answers, and prompted a row that has stretched to the other side of Europe.