A smartphone screen showing the Garmin outage.
Garmin's website and mobile app displayed these messages after a major disruption of the company's services.

An extensive outage has taken down Garmin’s website and app, cutting off consumer access to its customer service and fitness tracking services, along with parts of its website.

In a brief statement on its website, the fitness tracker and smartwatch maker doesn’t specify what caused the outage. An email seeking additional details wasn’t immediately returned. The outage was first reported Thursday and service remained down on Friday. Garmin GPS and other devices don't appear to be affected.

In addition to its main website, Garmin says the outage affects its Garmin Connect app, which collects and analyzes data from the company’s smartwatches and trackers. While those devices will continue to collect data, they can’t currently sync with the app.

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Garmin’s call centers have also been affected, leaving the company unable to receive calls, emails, or online chats.

As first reported by ZDNet, some media outlets attributed the outage to a ransomware attack, pointing to tweets allegedly posted by Garmin employees. But the company hasn't confirmed or denied those rumors.

Ransomware is a type of computer virus designed to infiltrate and lock down computers and the networks they’re connected to. Unless a ransom is paid, any data stored on the system remains encrypted and useless to its rightful owners. While in the past cybercriminals have targeted individual consumers with ransomware, most have moved on to bigger, more lucrative targets including hospitals, schools, and municipalities.

Slightly more than half of about 1,000 IT security professionals from around the world surveyed earlier this year by the email security company Mimecast said their businesses had been affected by ransomware the previous year. Those attacks took down their systems for three days, on average. 

While many ransomware attacks go unreported, recent high-profile victims have included the University of California, San Francisco and the city of Florence, Ala.

It's unclear whether any customer data was stolen, lost, or otherwise affected by the Garmin outage.