"We are ending our action because of the bad weather so as not to put our activists in danger," the organisation's Poland spokesman Jacek Winiarski told

Earlier on Thursday Greenpeace had said that three activists -- a Pole, Hungarian and German, had chained themselves to the anchor of the boat, the Croatian-flagged Hope, which was waiting at the entrance to the Polish port of Gdynia.

It was due to deliver a 25,000-tonne cargo of Argentinian-grown GM soya, Winiarski told AFP.

Other activists had unfurled a banner saying 'Poland doesn't want GMOs' on one side of the ship, while one sailboat and six inflatable speedboats which belong to Greenpeace had put to sea and were near the Hope.

Around 76 percent of Polish consumers are against the introduction into Poland of GM foodstuffs, according to Greenpeace.

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