Former FBI agent Nicole Parker warned that cyberattacks on grocery stores are "psychological warfare" that could reach the United States, according to a Fox News report on grocery store cyberattacks.

Fox News reported that Parker's warning centered on hackers who turned up supermarket freezer temperatures in Europe. According to the report's summary, Parker said such activity could next target U.S. critical infrastructure.

The report's headline describes the freezer incidents as a form of attack that could strike the country. The summary does not say how the freezer temperatures were changed, which European stores or companies were affected, or who was behind the activity. Those details are not contained in the material available for this story.

The summary does not say that any U.S. system has been targeted so far. It presents Parker's comments as a warning about possible future risk, and it uses the term critical infrastructure without defining it.

This story relies on a single source, the Fox News report, and no other outlet's reporting on the matter was available for comparison. The report's author field is blank in the material reviewed, and the summary contains no direct quotations from Parker beyond the wording of the headline.

Sources: Fox News: Grocery store cyberattacks are ‘psychological warfare’ that could strike US, former FBI agent warns.