UPDATE 1-Toronto exchange may delist marijuana firms with U.S. operations

TORONTO, Oct 16 (Reuters) - Canada's TMX Group Ltd, operator of the Toronto Stock Exchange, said on Monday that it may move to delist stocks of marijuana companies with interests in the United States, where their operations are illegal under U.S. federal law. TMX disclosed its plans as Canadian securities regulators tightened up rules requiring firms to disclose their operations in the United States.