Microsoft Windows IT outage: more than 2,000 flights canceled across US; Fedex and UPS report service delays – as it happened

This live blog is now closed. Follow more live coverage on the outage here.

• US transport, police and hospital systems hit by CrowdStrike IT outage
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The deputy spokesperson for New York City's mayor, Eric Adams, said that critical infrastructure and emergency operations, including the 911 call system, have not been impacted".

In a series of tweets, Fabien Levy wrote:

As this outage only affects Windows-based devices receiving automatic updates, our team at@NYCOfficeofTech has been working for the last few hours to halt any automatic updates and minimize potential service disruptions."