It was on the internal network but could be affecting other companies.

By Reuters
March 7, 2017

Verifone Systems is investigating a breach of its internal networks that appears to have impacted a number of companies running its point-of-sale card terminals, Krebs on Security said in a blog post citing sources.

Shares of the Payment card machine maker were down 2.7% at $19.89 in afternoon trading on Tuesday.

“Verifone says the extent of the breach was limited to its corporate network and that its payment services network was not impacted,” according to the report on Tuesday.

“We are currently investigating an IT control matter in the Verifone environment,” a Verifone executive said in an internal memo posted on the blog.

On Jan. 23, Verifone pay sent an urgent email to staff and contractors, warning they had 24 hours to change all company passwords, according to the blog.

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The email was in response to a notification that Verifone got from Visa v and Mastercard ma just days earlier in January, the blog reported.

Large retailers such as Target tgt and Home Depot hd have been victims of security breaches in recent years.

Verifone, Mastercard, and Visa did not immediately respond to requests for comment.

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