Climate change activists stormed a coal mine in Germany as they protested to "increase pressure on the government" over their concerns.
The action came two days after European Union leaders disagreed on a plan to make the bloc carbon neutral by 2050.
Police ordered protesters to leave the open-pit Garzweiler mine in western Germany, citing dangers which could be life-threatening.
German news agency dpa reported that some officers had been hurt, though it provided no further details.
Earlier on Saturday, dozens of protesters succeeded in temporarily blocking railroad tracks used to transport coal.
There were thousands of demonstrators in and around the western German village of Hochneukirch near the mine and adjacent power plants.
The majority of these protests were peaceful.
"It's important to increase the pressure on the government," protester Selma Schubert said. "The government doesn't do enough against climate change."
The mine has become a focus of environmental protests in recent years after its operator, German utility company RWE, threatened to chop down a nearby forest to enlarge it.
Chancellor Angela Merkel recently threw her weight behind the goal of making Germany climate neutral by 2050, following months of climate protests by students and a sharp rise in the polls for Germany's Green party.
Scientists say ending fossil fuel use by mid-century is a must if countries want to achieve the 2015 Paris climate accord's goal of keeping global temperatures from rising more than 1.5 degrees Celsius compared to pre-industrial times.
Additional reporting by agencies.
