A global Information Technology, IT, cyber outage has affected the operations of banks and airline operators globally.

The outage affected airlines’ operations in countries like Singapore, the United States and Australia.

The IT outage began in the early hours of Friday.

IT giant, Microsoft confirmed it was investigating an “issue” with its 365 apps and operating systems.

Microsoft said it had recovered some services, while warning that the issue was ongoing and users should expect “service degradation,” according to a status page on its website.

The outage has been blamed by some experts on social media on an update to the CrowdStrike security software, causing an issue with Windows software.

Crowdstrike ran a recorded phone message on Friday when its technical support was contacted, saying it was aware of reports of crashes on Microsoft’s Windows operating system relating to its Falcon sensor.