Two people are lying in the road at Kirby Misperton with their arms locked into a metal device as the fracking row continues.
Four vehicles containing about 15 people attended the hydraulic fracturing site at 4am on 2 October. They unloaded a metal device, believed to be a propane gas canister.
A police officer, one of two officers at the scene at the time, was pushed to the ground by a group of people and suffered an ankle injury after the device was pushed onto his foot.
A security guard, a man in his 40s, sustained a bite injury to his hand during the incident.
Two men lay in the road and locked their arms into the device.
Officers are at the site to ensure the two men in the road are safe and well.
A North Yorkshire Police team with specialist training and cutting equipment is assessing the scene.