The Brief

A technological meltdown left employees of airlines, banks, hospitals and emergency services around the world staring at the dreaded “blue screen of death” on Friday as their computers went inert in what is being described as a historic outage.

“This is basically what we were all worried about with Y2K, except it's actually happened this time,” internet security analyst Troy Hunt said via X.

From continent to continent, Microsoft users reported being suddenly knocked offline, and the culprit was determined to be cybersecurity company CrowdStrike, which says one of its routine software updates malfunctioned.

“CrowdStrike is actively working with customers impacted by a defect found in a single content update for Windows hosts,” the company said in a statement.

Customers using Mac and Linux operating systems were not affected, CrowdStrike said.

When the faulty update crashed computer systems, scores of airport travelers were stranded, hospital appointments were delayed and live news broadcasts were cut short.

How big is the outage?

It is massive, far-reaching and sudden.

Some computer problems cascade, creating ripples of failures. But in this case, the flaw permeated Microsoft systems worldwide nearly immediately. The company says its Windows 365 Cloud PCs, apps and services were affected.

While server-related outages are common, the scale of the CrowdStrike disruption was astonishing to many tech observers.

Passengers wait in front of check-in counters at the capital's Berlin Brandenburg Airport, in Schönefeld, Germany, on Friday after a widespread technology outage disrupted flights, banks, media outlets and companies around the world.

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“This IT outage is a stark reminder of how dependent we are on technology and many other things that happen behind the scenes that most of us are unaware of,” said Louisville-based tech executive Adam Robinson on X. “Modern society and the many comforts we enjoy is a fragile thing.”

What kinds of companies and services went offline?

Delta Airlines, United Airlines and American Airlines grounded all flights.

In some states, including Alaska and Ohio, 911 phone lines were down.

The U.K.’s National Health Service has been widely affected. The NHS said Friday that doctors’ appointments and patient records had been affected but that there was no known impact on emergency services. The BBC reported that two-thirds of doctors’ practices in Northern Ireland had been affected, with doctors unable to access patient records, generate prescriptions or see the result of laboratory tests.

In Germany, some hospitals canceled non-emergency operations.

The London Stock Exchange’s news service stopped working.

Broadcasters around the world were also hit. In France and Australia, live television broadcasts were knocked offline.

Sky News, a major U.K. news channel, was off air for a time on Friday morning. It later returned, but without “full capabilities,” its chairman, David Rhodes, said on X Friday afternoon. A post on Australia’s ABC News website said the broadcaster was experiencing a “major network outage.”

How do people fix their computers?

CrowdStrike says the problem was not a cyberattack, but rather a software glitch. The company said the issue has been identified and that a fix was sent to customers.

An airport information screen displays an error message rather than travel information at San Francisco International Airport on Friday after a computer problem unraveled systems in the U.S. and dozens of other countries.

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It also published a workaround that involves booting a Windows machine in a recovery environment, deleting a single file in the CrowdStrike directory, and restarting.

What is CrowdStrike?

It’s a U.S. cybersecurity firm based in Austin, Texas. The company went public in 2019 and is currently in the S&P 500 index. As of early July, CrowdStrike’s stock had been riding months of gains. But share prices fell sharply in early trading Friday.

“This is clearly a major black eye for CrowdStrike,” said WedBush analyst Dan Ives.

CrowdStrike made headlines in 2016, when the company was hired by the Democratic National Committee to investigate a breach of its data systems. CrowdStrike determined that the hack was a case of foreign interference — the work of Russian-backed hacking groups.

The company’s marquee product is its “Falcon” cybersecurity software — and it traced the current problem to a change in a sensor in that system. That also helps explain how and why the resulting failures spread so quickly: Rather than being stored locally, the Falcon security platform “is 100% cloud-based.”

Los Angeles police officers shot and killed a man who appeared to be armed with a rifle outside the California Science Center in Exposition Park on Thursday morning, according to LAPD Deputy Chief Marc Reina.

Reina said police do not yet know the identity of man, who they estimate was about 35 years old.

No police or other community members were injured in the incident, Reina said. The science center was placed briefly on lockdown but reopened. The north side of the museum remains closed, the deputy chief said.

Reina said a motorcycle cop initially spotted the man around 9:30 a.m. carrying what appeared to be a rifle and walking west down State Drive, a small road that runs between the science center and Exposition Park Rose Garden.

Multiple cops responded to the scene and faced off with the man. The subject continued down State Drive, Reina said, before police opened fire.

Los Angeles Fire Department personnel arrived at the scene and pronounced the man dead, Reina said.

The incident will be investigated by department use-of-force investigators, the Los Angeles District Attorney’s Office and the LAPD’s inspector general, the deputy chief said.

Investigators have not yet determined what prompted police to open fire, Reina said. Police do not believe the man fired his weapon.

Here's what witnesses saw

Stacey Hutchinson said he was sitting on a bench along State Drive drinking a cup of coffee when the incident unfolded.

He said the man appeared in good spirits and greeted him nonchalantly as he walked up the street before taking a seat. Hutchinson said he saw the man carrying what appeared to be a long gun.

Police initially responded with bean bag guns, Hutchinson said, but drew firearms when the man picked up the weapon.

Police opened fire after the man pointed the apparent rifle in their direction, Hutchinson said.

The man did not appear to be trying to enter the science center, Hutchinson said, and appeared to remain calm until police asked him to drop his weapon.