Limpopo Transport authorities say the R71 at Magoebaskloof, outside Tzaneen in Limpopo, has been closed to traffic following a gas truck explosion earlier this morning.
The explosion has caused veld fires in the Magoebaskloof area.
The truck was travelling from Polokwane to Tzaneen. A truck driver has been hospitalised with minor injuries.
Department spokesperson Matome Moremi Taueatsoala says no injuries have been reported so far.
"The Department of Transport and Community Safety has warned motorists about a serious incident on the R71 in Magoebaskloof, where a gas cylinder crashed and caused multiple explosions, igniting a fire in the nearby plantation. The R71 is currently closed to all traffic until further notice. Emergency services are on the scene, working to contain the situation. Motorists are advised to use Georges Valley Road or follow alternative routes as directed by authorities."