CTV News has learned that two more Russian diplomats have left Canada in the wake of an espionage scandal involving a junior Canadian naval officer.

Sources say a defence attaché in Ottawa and a consulate worker in Toronto have been sent back to Russia. The Russian embassy says they left simply because their contracts had ended.

Sub.-Lt. Jeffrey Delisle, 40, was charged two weeks ago with leaking information to a "foreign entity" and breach of trust.

He is also charged under the Criminal Code with a breach of trust by a public officer.

Shortly after Delisle's arrest, four Russian embassy staff were sent back home. Moscow denied their return had anything to do with the espionage allegations.

The Canadian military then relocated some staff at its East Coast intelligence centre out of precaution.

Sources say that the leaked information could include data on underwater dead zones, which would allow Russian submarines to penetrate sensitive areas. Weapons system information may also have been leaked.

Delisle's next court appearance has been scheduled for Feb. 28, when a date for a bail hearing will be set. His lawyer withdrew from the case last week without offering a reason.