Firefighters are continuing to battle a blaze in Mount Gambier's Crater Lakes area.
The fire is burning near the historic Centenary Tower and smoke is billowing across the city.
Water bombers are regularly flying over Mount Gambier, dumping water on the blaze.
The Metropolitan Fire Service (MFS) says the fire is burning in difficult terrain.
"It is not contained, but it is not a threat to property or life," a spokesperson said.
The spokesperson said four MFS trucks, seven Country Fire Service appliances and two bulk water carriers were at the site.
"We expect the fire will burn into the night and tomorrow," they said.
Drone warning
The MFS has warned the public not to use drones in the area after water bombing activities were halted earlier today for that reason.
It is understood Limestone Coast Police are investigating the illegal use of drones in the area.
The fire is burning in vegetation close to Centenary Tower near Haig Drive, Elliot Drive and Grant Avenue.
The Country Fire Service (CFS) has issued an advice message asking residents to stay alert and monitor local conditions as smoke spreads across the city.
The Metropolitan Fire Service (MFS) is urging Mount Gambier locals to avoid the area.
MFS regional commander Mick Shepherd said about three hectares of vegetation was burning.
"They're finding it rather challenging because access into that area is fairly difficult but they've managed to gain access and slow the fire down."
Commander Shepherd said water bombers had also been deployed.
"We've had to wait for first light before we could get them up," he said.
"Hopefully once they're up, we can get to the inaccessible area and stop any more fire spread."
Only vegetation on the side of the valley has been affected so far.
"No infrastructure has been impacted at this point," Commander Shepherd said.
"There were concerns about the cemetery, but we've managed to protect [it]."
Authorities are asking Mount Gambier locals to stay away from the area.
"I know that it's a popular walking trail in that area but we'd ask that the community stays away from that area this morning," Commander Shepherd said.
"There's significant smoke in that area."
Commander Shepherd said it was "too early for any indication" as to how the fire started.
Meanwhile, South Australian Police urged anyone who saw or heard any suspicious activity in the area to contact Crime Stoppers on 1800 333 000.
