Australia's Qantas Airways said on Wednesday (Jul 9) more than a million customers had their phone number, birth date or home address accessed in one of the country's biggest cyber breaches in years.

The cyber incident was discovered on June 30, and is believed to have compromised the data of up to 6 million customers.

A cyber criminal has made contact with Australia's Qantas following a data breach last week that exposed personal information of six million customers, a company spokesperson told Reuters on Tuesday.