Documents: FBI told Canadian police of possible security breach involving military officer

Search warrants used in the case of a Canadian Navy intelligence officer who pleaded guilty to espionage say Canadian police began investigating the man after the FBI alerted them of a possible security breach.

Redacted versions of three search warrants were released Thursday.

The warrants were used to obtain evidence against Sub-Lt. Jeffrey Paul Delisle, who pleaded guilty last month to passing classified information to Russia.

One document says police opened an investigation into Delisle's activities after it received a letter in late 2011 from FBI assistant director Frank Figliuzzi alerting them of a possible security breach involving a Canadian military officer. It doesn't address how the FBI knew that.

Delisle worked at a naval intelligence center in Halifax, Nova Scotia and had access to secret data from NATO countries.