A software update led to a worldwide information technology outage, wreaking havoc on major industries, from travel to healthcare and finance, even causing problems for athletes ahead of the Olympic Games.

Systems running Microsoft Windows crashed on Thursday evening, after a content update from cybersecurity software CrowdStrike.

“We are working hard to provide comprehensive and continuous updates with our global customers as quickly as possible,” according to a statement on CrowdStrike’s website. They assured customers that the glitch was not a security incident or cyberattack.