A probe into beef prices is underway, with several major retailers receiving letters. Companies targeted include well-known names such as Costco and Walmart. The investigation is focused on recent price increases for retail beef.

The US Department of Justice is behind the inquiry, with a statement noting the importance of beef prices to Americans. This issue is a priority for the department.

Further details about the investigation and related actions, such as a recent proclamation on beef imports, are available from the original source.