Global tech outage stops banks, airlines and businesses [Video]

WASHINGTON — A faulty software update caused technological havoc worldwide on Friday, grounding flights, knocking down some financial companies and news outlets, and disrupting hospitals, small businesses and government offices.

The trouble was sparked by an update issued by cybersecurity firm CrowdStrike and only affected its customers running Microsoft Windows, the world’s most popular operating system for personal computers. It was not the result of hacking or a cyberattack, according to CrowdStrike, which apologized and said a fix was on the way.

Businesses and governments worldwide experienced hourslong disruptions — their computer monitors glowing blue with error messages — and they scrambled to deal with the fallout. CrowdStrike’s CEO said some of their systems will require time-consuming manual fixes.

Thousands of flights were canceled and tens of thousands were delayed, leading to long lines at airports in …