The Dutch food safety authority VWA has found animal feed containing illegal genetically-manipulated maize on a number of Dutch farms, the Volkskrant reported on Friday. The pellets are thought to come from a shipment of contaminated maize found by Greenpeace in Rotterdam in early April.

At the beginning of this week, the European Commission told the Netherlands to trace the maize and return it to the US. Greenpeace has called on the public prosecution department to launch a criminal investigation into the shipments.