CHICAGO (From news reports) -- R.R. Donnelley & Sons Company said Monday it is not aware of any compromise of client data after recently finding a systems intrusion in its technical environment.

The company said in a regulatory filing that it has implemented a series of containment measures, including activating its incident response protocols and shutting down its servers and systems. It has also hired a cybersecurity expert to examine the incident while working with law enforcement authorities.

The communications company said it is in the early stages of its investigation and cannot determine at this time the extent of the material adverse impact, if any, from such event on its business, results of operations, or financial condition.