“More than 10 million Australians were cut off from internet and phone services on Wednesday after unexplained outages struck one of the country’s largest communications companies.

The mystery glitch crashed electronic payment systems, disrupted phone lines used by ambulances and police, and briefly halted rush-hour trains in the southern city of Melbourne.

Optus, a subsidiary of Singapore telecommunications company Singtel, said it had restored services on Wednesday evening — but it was unable to pinpoint what had caused the fault.”