(CNN) - A system outage is disrupting service at some CVS pharmacies across the country.

Tuesday, the company said a network connection issue is preventing certain locations from delivering medicine to customers.

Frustrated customers have flooded social media with complaints, saying they can’t pick up prescriptions or get tests and vaccines.

CVS said most locations remain operational and they’re working to restore service as quickly as possible.

It’s unclear what caused the outage.

CVS operates more than 9,000 pharmacies nationwide

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