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CTV News Vancouver confirmed that RCMP officers were involved in the Wednesday bust, which was led by the U.S. Drug Enforcement Agency (DEA). Homeland Security is also involved in the investigation.
A greenhouse targeted in the search is located near 264th Street and Zero Avenue in Langley, B.C., south and east of Vancouver. The town on the U.S. side of the border is Lynden, Wash.
The tunnel was described as sophisticated and well-maintained. Authorities had been watching construction on the site for eight months.
The exact length of the tunnel was not known, but a source told the Associated Press that it ran from the building on the Canadian side, and ran south to a house on the U.S. side about 90 metres from the border.