A massive hacking at the U.S. Office of Personnel Management (OPM) that breached identification data of an estimated 4 million current and former federal government workers, "may include" some current and former NCUA employees, the agency said.

The federal regulator said the OPM alerted NCUA about the possibility of the breach's impact on current and former NCUA personnel.

"NCUA cares deeply about our employees' privacy and security, and the agency is working closely with OPM to monitor the effects of the breach and provide employees with tools to help them protect themselves," the agency said.

OPM, which serves as the human resources department for the federal government, performs background checks for security clearances for potential federal employees.

Last week, the Department of Homeland Security (DHS) said in a statement that that "data compromise" at OPM as well as the Department of Interior had occurred sometime in April 2015 and detected in early May.

"The FBI is conducting an investigation to identify how and why this occurred," the DHS said. "DHS is continuing to monitor federal networks for any suspicious activity and is working aggressively with the affected agencies to conduct investigative analysis to assess the extent of this alleged intrusion."

Also, in response to the incident, OPM said that it has "undertaken an aggressive effort to update its cybersecurity posture, adding numerous tools and capabilities to its networks."

OPM said it began sending notifications to the 4 million individuals whose Personally Identifiable Information was potentially compromised in this incident and will contain information regarding credit monitoring and identity theft protection services being provided to those Federal employees impacted by the data breach. The agency said it expected to complete the notification process June 18.

To mitigate the risk of fraud and identity theft, OPM also said it will offer the affected individuals "credit monitoring services and identity theft insurance with CSID, a company that specializes in identity theft protection and fraud resolution."

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