Greenpeace activists prevented a ship from unloading U.S. genetically modified soybeans on Monday, but allowed a batch of traditional soybeans to be brought ashore, Reuters reported. The freighter Polidefkis P. arrived at this southwestern port city early in the day carrying a 22,000-ton cargo of oilseeds from New Orleans. Militants from the Greenpeace environmentalist group at first tried to stop the boat from docking but later relented amid fears the Greek-registered ship might run aground at low tide. Around 40 activists then prevented the unloading of the cargo by taking over two port cranes. They only let some of the oilseeds off after being told they did not contain genetically modified organisms (GMOs).