Updated

The European Union has asked Poland to stop massive logging in one of Europe's last remaining primeval forests, warning it might take Poland to the European Court of Justice if it doesn't reverse course.

The European Commission, the executive arm of the EU, said Thursday it has given Poland "a final warning" to stop the large-scale felling of trees in the Bialowieza Forest. The commission said Warsaw now has a month to react, rather than the customary two-month deadline, due to the threat of "serious irreparable damage" to the lowland forest.

Poland's government last year decided to increase logging in the forest threefold. The previous level had been considered sustainable. So far thousands of trees, some more than 100 years old, have been cut down.