About a dozen demonstrators with the Aamjiwnaang First Nation in Sarnia, Ont. blocked the CN line on their reserve Friday, Dec. 21 to protest the federal government's Bill C-45. (CATHY DOBSON/QMI AGENCY)

The Canadian Propane Association is urging officials to stop a CN rail blockade at Aamjiwnaang First Nation that will threaten thousands of Canadians if it continues.

In a letter to Sarnia Mayor Mike Bradley, CPA president and CEO Jim Facette urged the federal government, mayor's office and police to "take the necessary steps to remove the rail blockade in an orderly and safe manner."

"Sarnia is a key point of departure for the transportation of propane east into Ontario, Quebec and Atlantic Canada," the letter states.