McDonald’s said on Friday that a large number of its restaurants around the world were affected by a “technology failure” that halted automated order-taking systems, but ruled out a cyber attack against them, Reuters reported.

In Japan, many of the fast-food chain’s restaurants can no longer accept orders either through digital counters or mobile phone apps, a McDonald’s Japan representative confirmed. He added that qualified personnel are working on eliminating the problem.

“We are aware of a technology failure that affected our restaurants and the issue is being resolved,” McDonald’s said in a press release.

In Australia, some of its restaurants are already back “online” for customers, and efforts are underway to resolve issues in other units.

McDonald’s has about 40,000 restaurants worldwide, more than 14,000 of which are in the United States.

In Japan and Australia, the two countries where the company appears to have suffered the most on Friday, McDonald’s has about 3,000 and 1,000 restaurants, respectively.

Although the extent of the problem is not entirely clear, Reuters notes that McDonald’s customers in Hong Kong, New Zealand and Britain have also complained on social media about problems at the company’s restaurants.

The New York Times reports that McDonald’s Hong Kong is experiencing a “computer system failure” and that neither the company’s app ordering service nor the restaurant’s digital take-out counters are working.