He is one of British Columbia's most notorious gangsters, but even though Clayton Roueche is in jail, he is allegedly still causing trouble. CTV News has learned that U.S. authorities decided to move Roueche to a new prison because of an alleged plot to escape.

Sources have told CTV News that Roueche allegedly hatched a plan to break out of Seatac detention facility in Seattle, where he was being held on drug smuggling charges.

Canadian police say Roueche is the leader of the UN Gang, one of B.C.'s most violent drug gangs.

And sources say he had an alleged accomplice, another Canadian housed in the same jail, named Luke Elliot Sommer.

Last December, Sommer was sentenced to 24 years in prison, after he robbed a bank in Tacoma, commando style.

Sommer was trained as a U.S. Army ranger.

According to court documents, Sommer recruited his army buddies to pull off the heist.

Surveillance pictures of the robbery show men armed with AK 47 assault rifles.

" I can't remember in my 29 years where five people possibly with military backgrounds were involved in a crime of this sort,'' Chris Taylor of the Tacoma Police said.

After that robbery, Sommer was arrested near Kelowna and sent back to Washington State.

Sources say Sommer and Roueche became acquainted while in jail at Seatac.

The alleged prison break plot apparently involved explosives and if necessary killing guards.

Seatac officials won't comment.

But in a court document, they admit Roueche posed a security and safety risk to the orderly running of the federal detention centre.

So Roueche has now been moved to a high security prison in Illinois.

With a report by CTV British Columbia's Lisa Rossington