Australia’s Optus Sees No Sign of Cyberattack in Large-Scale Outage

SYDNEY—Singapore Telecommunications-owned Optus has no evidence that a cyberattack was to blame for a network outage affecting millions of customers including emergency services, hospitals and transport systems.

The cause of Wednesday’s outage at Australia’s second-largest mobile operator, which in 2022 was hit by a cyberattack in which customer details were stolen, had yet to be identified more than seven hours after customers first complained of problems. There was no sign of an attack and software issues were highly unlikely, Optus Chief Executive Kelly Bayer Rosmarin said.