Photo: Google Street View CFB Halifax

Military police in Halifax are investigating an alleged security breach at one of the Royal Canadian Navy's most sensitive security operations.

According to court documents, military investigators allege that between 2004 and 2009 a web designer working at HMCS Trinity — the military's principal East Coast intelligence centre — used Defence Department networks to improperly store secret files.

A search warrant filed in provincial court alleges the actions of a man identified only as "Mr. Zawidski" violated a section of the federal Security Information Act that deals with wrongful communication of information.

None of the allegations has been proven in court and a military spokesman couldn't confirm whether charges have been laid.

The warrant says military police seized four hard drives, a laptop computer, some CDs and floppy disks from Zawidski's Halifax office at HMCS Dockyard in September following a complaint about a possible security breach.

The document says Zawidski's personal network drive contained 1,086 secret documents, dated between 2004 and 2009.

In February 2013, Sub-Lt. Jeffrey Paul Delisle — a navy intelligence officer — was sentenced to 20 years in prison for copying secret computer files at HMCS Trinity and selling them to Russia between 2007 and 2012.