Poland's rightwing government broke the law by logging in one of Europe's last primeval forests, a UNESCO world heritage site, the European Union's top court ruled Tuesday.
Logging in the Bialowieza Forest began in May 2016 but the European Commission took Poland to court last year arguing that it was destroying a forest that boasts unique plant and animal life.
"The forest management operations concerning the Puszcza Bialowieska Natura 2000 site that have been undertaken by Poland infringe EU law," the European Court of Justice said in a statement.
It said that the Polish government must comply with the court ruling to stop logging "without delay" or face financial penalties.
Bialowieza, which straddles the border with Belarus, includes one of the largest surviving parts of the primeval forest that covered the European plain 10,000 years ago.
Explore further: EU hauls Poland to top court over ancient forest logging