FOUR campaigners have been arrested at Britain's largest coal-fired power station.
About 600 demonstrators are at the protest at Drax Power Station in North Yorkshire.
Some protesters have said they plan to close down the massive plant which they say is Britain's worst polluter.
Two people were arrested on suspicion of carrying a weapon and two were held after being found in the Drax premises.
Reports that seven people were inside Drax and up a lighting tower have been dismissed by police.
North Yorkshire Police's Deputy Chief Constable Ian McPherson said: "We have a number of individuals who joined us in North Yorkshire who largely are behaving themselves.
"However we are conscious that within that group there is a hardcore - a number of individuals who have made their aims very clear, see themselves as risingabove the law and it's those individuals who I think will undermine what is a serious point."
A spokeswoman for the protesters said their actions would involve attempts to trespass on the site. Drax Power gained an injunction earlier this month banning unauthorised people from entering the site.
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