United Natural Foods Inc one of the largest U.S. grocery distributors whose clients include Whole Foods, took certain systems offline in recent days after the discovery of unauthorized activity on internal networks,

A string of recent cyberattacks and data breaches involving the systems of major retailers have started affecting shoppers.

At Cub Foods, which was acquired by UNFI in 2018, it has meant many of its pharmacies were taken offline, unable to fill new and refill prescriptions.