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McDonald's says a global IT outage that prevented its servers from processing payments and saw restaurants closed across Australia and several other countries on Friday evening was not a cybersecurity incident.
The company has also confirmed some of its restaurants' systems are now back online, and it is working to restore service to the remainder of its restaurants as soon as possible.
"The issue is now being resolved," a McDonald's spokesperson told the ABC.
"We thank customers for their patience and apologise for any inconvenience this may have caused.
"Notably, the issue is not related to a cybersecurity event."
The outage mainly impacted the company's internal systems, with one McDonald's employee telling the ABC that servers couldn't see anything on their computer screens.
It also affected the MyMacca's app, with reports to global outage tracker Downdetector spiking from about 4:30pm AEDT.
The technology issues caused chaos across the fast-food chain's global operations, with stores being closed in Australia, Japan, the United Kingdom and New Zealand.
Restaurants in Canada, Hong Kong, Germany and Austria were also reportedly affected by the issue.
McDonald's operates about 1,000 restaurants in Australia, its website shows.