NJ Transit police officers were targeted by hackers associated with the ISIS terror group who encouraged supporters to carry out "lone wolf" attacks on the officers, the agency confirmed.

Caliphate Cyber Army, formerly known as the Islamic Cyber Army, recently posted personal details about 55 transit officers, SITE Intel Group, which monitors Jihadist cyber activity, reported earlier this month.

Philly.com inquired about the SITE Intel report then, but NJ Transit did not reply until Newsweek published a story about the incident on Tuesday.

NJ Transit said the hackers breached the server of an unidentified outside contractor which contained the information.

Lisa Torbic, a NJ Transit spokeswoman said Tuesday that the agency was working with federal officials investigating the incident.

"The NJ Transit Information System was not compromised. However some information was breached from an outside vendor," according to a statement Torbic provided. She did not elaborate.

FBI spokesman Mike Whitaker did not return a telephone message Tuesday seeking comment.

- Melanie Burney