An Amazon Web Services outage is wreaking havoc on the e-commerce giant’s delivery operation, preventing drivers from getting routes or packages and shutting down communication between Amazon and the thousands of drivers it relies on, according to four people familiar with the situation.

Three delivery service partners said an Amazon.com Inc. app used to communicate with delivery drivers is down. Vans that were supposed to be on the road delivering packages are sitting idle with no communication from the company, the person said.

Amazon Flex drivers, independent delivery people who carry parcels in their own cars, can’t log into Amazon’s app to get assignments, said another person.

The problems come amid Amazon’s critical holiday shopping season when the e-commerce giant can ill afford delays that could potentially create lasting log-jams.

Amazon, through a spokeswoman, didn’t immediately comment on the problems in its delivery operation.

The outage began at about 10 a.m. eastern time, according to DownDetector. At the height of the outage, the web monitoring site reported more than 20,000 complaints for Amazon and more than 11,000 for the company’s cloud computing arm, Amazon Web Services. By 1:45 p.m., the reported outages had declined by about half for AWS and two-thirds for Amazon.

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Multiple popular websites were affected, including those operated by Coinbase, Robinhood, Disney+ and Netflix, according to DownDetector. Webcast presentations from Comcast Corp. and Altice USA Inc. at UBS’s Global TMT Conference experienced disruptions earlier Tuesday, and the Charter Communications Inc. presentation was rescheduled to Wednesday. The outage also hit Ticketmaster, delaying the pre-sale window for Adele’s new tour by four hours.

Some Amazon services, including music and video streaming, the voice-activated Alexa platform and security arm, Ring, were affected, too.

AWS said it had identified the cause of “increased error rates” and is working to fix it. Meanwhile, the company is directing customers to alternative servers in its western region that aren’t experiencing problems. The increased errors are in the eastern North American region. Multiple Amazon cloud-computing services were affected, including Amazon DynamoDB and Amazon Elastic Compute.

Video streaming service Netflix experiencd a 26% drop in traffic after the AWS problems were reported, showing how quickly outages can ripple outward, said Doug Madory, an analyst at the network monitoring firm Kentik in San Francisco.“It gets more and more complicated with software running these services, so when something goes sideways it can take a long time to figure out what went wrong and fix it,” he said. “Complexity has risks. You introduce unknown errors.”

Amazon declined to comment on the outage and directed users to its AWS dashboard.

AWS is the leading cloud-computing provider, selling companies  computing power and software services on demand rather than maintaining their own data centers and teams in-house. Its customyers include a wide range of industries and the federal government.

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—Bloomberg News