Australian logistics company Toll last week suffered an "IT cybersecurity incident", forcing the shutdown of a number of customer-facing systems days later.
In a tweet posted overnight, Toll said the shutdown was a precautionary measure.
"As a precautionary measure, Toll has made the decision to shut down a number of systems in response to a cybersecurity incident. Several Toll customer-facing applications are impacted as a result. Our immediate priority is to resume services to customers as soon as possible," the company wrote.
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In response, customers are reporting that the incident has been "occurring for days" and that staff are telling customers deliveries are suspended indefinitely.
"As we continue to make progress in restoring customer-facing applications and services in the coming days, we will provide further advice on expected timeframes," a second tweet from Toll said.
"We will continue to provide regular updates. We sincerely apologise for any inconvenience caused."
Toll Group, part of Japan Post, operates a global logistics network across 1,200 locations in more than 50 countries. Toll provides a range of transport and logistics solutions covering road, air, sea, and rail.
It boasts over 40,000 employees and has been around for over 125 years.
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