Police spokesperson in the Free State, Ian Gaobepe, says police were on the scene redirecting traffic to the N1 after a fire broke out at about 15:00.
Smoke and dust caused by strong winds contributed to poor visibility. He says firefighters managed to extinguish the fire at around 16:00. According to Gaobepe a fire truck was also damaged.
He says at this stage the cause of the fire is unknown. The injured firefighters were rushed to a nearby hospital.