TORONTO (Bloomberg) - The Canadian Auto Workers union ruled out a strike as it considers how to respond to General Motors Corp.'s planned closure of a truck plant in Oshawa, Ontario.

Arbitration, legal action or an appeal to the Ontario Labour Relations Board are all under study, union spokeswoman Shannon Devine said, confirming remarks from CAW president Buzz Hargrove reported by the Canadian Broadcasting Corp.

Production at the factory was disrupted yesterday after protesting workers disrupted delivery of parts, GM spokesman Stew Low said in an e-mail. About two hours of production, or the equivalent of 120 vehicles, was lost, Mr. Low said.

Union workers began a blockade at GM's Canada headquarters near the plant on June 4 after the world's largest automaker said it was closing the factory in 2009 as high oil prices damp truck sales. GM said it is seeking "necessary legal means" to disperse the demonstrators, who are planning a June 12 rally.

Tony Sapienza, a spokesman for Detroit-based GM, said he was not aware of any protests being organised at the other factories being closed.