Seven fire crews are battling a "large" fire at a nature reserve.
Staffordshire Fire Service was called to the blaze at Hednesford Hills shortly after 13:00 BST.
Firefighters were positioned along Valley Road, close to Cannock Chase Museum and Reservoir Road, to try and quell the flames.
Crews from Uttoxeter and Kinver were sent to help, with specialist equipment also brought in. Police warned people not to enter the area.
We currently have 6 crews from across @StaffsFire dealing with a large grass fire on Hednesford Hills Common, Valley Road, Hednesford.— Staffordshire Fire (@StaffsFire) July 22, 2018
"Firefighters are tackling the fire from different angles, which is why we and the police are advising the public to stay away as it covers a large surface area," the fire service said.
Police took to social media to deter the public from visiting the nature reserve and said they had closed Reservoir Road while the fire crews were at work.
We are currently assisting Staffordshire Fire And Rescue with a fire adjacent to Hednesford Hills Raceway in the wooded area. Reservoir Road is also closed. We are asking for people to avoid this area and make alternate travel arrangements if necessary. pic.twitter.com/fffNiZWYoa— Staffordshire Police (@StaffsPolice) July 22, 2018
Cannock Police said the fire was contained but could take several hours to extinguish.
There is a fire on Cannock Chase in the Hednesford Hills area. Our colleagues @StaffsFire are working hard and have contained the fire but it will take many hours to extinguish.— Cannock Police (@CannockPolice) July 22, 2018
Please stay away from this area of the Chase today, both on foot and in vehicles in this area. Thanks pic.twitter.com/twMPcSwJzE
Earlier this month, Staffordshire Fire Service said a grassland fire in the reserve was "probably started by accident".