Unknown hackers could obtain personal data of 134.000 U.S. sailors, Navy Times reported.

The Navy was notified in October by Hewlett Packard  Enterprise Services  that a computer supporting a Navy contract was “compromised,” and that the names and social security numbers of 134,386 current and former sailors were accessed by unknown persons.

The Naval Criminal Investigative Service is in the early stages of investigating the breach, but in a release said it hasn’t found any malicious use of the data yet.