There was an explosion at South Africa’s second-largest crude oil refinery in Durban on Friday morning, a local metropolitan police official told Reuters, adding it was not yet clear whether there had been injuries or deaths.

A spokesman for Engen, which operates the refinery, said he would comment later in a statement.

According to Engen’s website, the Durban plant has a crude refining capacity of 120 000 bbl/d.

It was not immediately clear if there was any impact on the refinery’s production.