South Africa’s state-owned firm Transnet said on Friday it had identified and isolated the source of the disruption to its IT systems, which impacted its container terminals.

The freight logistics firm was hit by a suspected cyber attack, three sources with direct knowledge of the matter told Reuters on Thursday, affecting some of its container terminal operations.

Transnet, which operates major ports and a huge railway network, said it was prioritising the export of reefer containers, used mainly to transport perishable cargo at a controlled temperature, primarily through the port of Durban as this was the peak of the citrus season.

In June, the National Ports Authority reported that it is to become an independent subsidiary of Transnet with its own board.

This was announced by president Cyril Ramaphosa on Tuesday morning.

He said the creation of the entity will allow the Port Authority to make its own investment decisions and ensure that it treats all terminal operators fairly and equally. He says this is part of government’s efforts to accelerate economic structural reforms.

Ramaphosa says Public Enterprises Minister Pravin Gordhan will appoint the interim board of the new entity by the end of June.