Australian airline Qantas disclosed that it detected a cyberattack on Monday after threat actors gained access to a third-party platform containing customer data.

Qantas told the Financial Times it was investigating whether the Scattered Spider cyber criminal group was behind the attack. The strike comes days after the FBI warned there were signs the group had started to target the global airline sector.

The hack of the Australian carrier follows recent incidents at Hawaiian Airlines and Canada’s WestJet. Here’s what you need to know. Qantas said on Wednesday it is contacting customers after a cyberattack targeted a third-party customer service platform that stored the personal data of 6 million customers.