Just Stop Oil protesters at Kingsbury depot
About 50 protesters have been staging a sit-in at an oil depot.
Members of the Just Stop Oil group gathered with banners to block an entrance of the Kingsbury Oil Terminal near Tamworth on Wednesday.
In April, North Warwickshire Borough Council had obtained a High Court injunction against protests taking place outside the site.
Warwickshire Police said a number of arrests had been made on suspicion of the court order's breach.
The order gives a power of arrest outside the terminal and at the junctions of nearby roads.
Some tankers were prevented from getting on to the site from about midday on Wednesday, when the protest began. It is believed trucks have been directed to another entrance.
A local business owner, who said he operated a firm that ran fuel tankers in and out of the base, confronted the activists and urged police to "get these idiots out the way".
The man, who did not wish to be named, claimed activists had previously "drilled the sidewalls of 364 tyres" on trucks, vans and cars at the terminal, a nearby truck works and another neighbouring depot, causing damage estimated at £184,000.
Zoe Cohen, from Just Stop Oil, highlighted the new King's comments to the COP26 global climate summit in Glasgow last year that "we're out of time" in terms of damage to the environment.
"He said time has run out and we need to be on a wartime footing, a war-like footing, and that's the level of transformation we need in society," she said.
In a statement, Warwickshire Police said the force was aware of protest activity in Kingsbury and officers were in attendance.
Follow BBC West Midlands on Facebook, Twitter and Instagram. Send your story ideas to: [email protected]