Country Fire Service personnel have been seriously injured in the state's south-east, according to South Australian Premier Steven Marshall.
Before today's COVID-19 press conference, Mr Marshall said the incident involved a CFS truck and a tree and he was awaiting further details.
"I have just been advised that there has been a serious incident, a CFS vehicle and a tree, down in the south-east," he said.
"We believe the people on board have sustained serious injuries, I haven't got the full details."
He said further information should be known soon.
"I do genuinely want to say thank you to every single person who works on the front line, we have had significant fires down in the south east, particularly around the Lucindale area in the past 48 hours," Mr Marshall said.
Firefighters battle forest blazes in Argentina
With temperatures climbing upwards, firefighters were deployed ahead of the weekend to forest fires in nine of Argentina's 23 provinces, including one blaze that has been active for more than a month. Nearly 100 firefighters and support staff, reinforced by planes and helicopters, were fighting the largest of the fires in the Nahuel Huapi National Park, the fire management service (SNMF) said. The park is located near the tourist city of Bariloche, about 1,500 kilometers (950 miles) southwest of Buenos Aires."This is one of the most serious fires we have had in the region," SNMF director of operations Lorena Ojeda told AFP.
"My grateful thanks to every single firefighter that puts their life on the line to protect our lives and our property."
About 150 firefighters from South Australia and Victoria have been battling the blaze near Lucindale, about 350 kilometres south east of Adelaide.
The fire has been burning in a bluegum forest about 20km south of the township.
The fire was downgraded to an advice level last night with the CFS advising it was no longer a threat to life of property, however, it was was still burning out of control.
Authorities said people in the area needed to stay alert, monitor local conditions and decide what they would do if the situation changed.
The CFS said the fire had earlier broken containment lines and multiple spotfires had started to the west of the fireground.
Emergency messages were sent to locals at risk and ground crews were working to get to affected properties earlier on Thursday night.