JOHANNESBURG: Operating systems have been restored at South Africa's state-owned logistics firm, the company said Thursday following a cyber-attack last week that hit the country's key port terminals. The attack began on July 22 and lasted for days, forcing Transnet to switch to manual systems.

Disruptions, which impacted exports and imports into the country, eventually pushed the company to declare a force majeure - a clause that prevents a party from fulfilling a contract because of external and unforeseen circumstances.

In an audio statement on Thursday the firm reassured that supply chains were back to normal.

"Transnet has managed to restore operations at the ports," said Transnet spokeswoman, Ayanda Shezi.

She said the firm was collaborating with shipping lines to move urgent containers for the automotive and agricultural sectors, while rail operations were running on schedule.

The outage came on the heels of civil unrest sparked by the jailing of ex-president Jacob Zuma that halted operations for several days. But the government was quick to say it was "unrelated".

The attack affected ports in Durban - the busiest in sub-Saharan Africa - as well as Cape Town, Port Elizabeth and Ngqura.