The strike against General Motors is now on a fourth day.
Tensions increase when a United Auto Workers official says that about seven to nine unions were arrested for blocking a road at a GM plant in Tennessee.
The arrests came Wednesday at the Spring Hill facility, according to local UAW chairman Mike Herron.
The authorities repeatedly asked protesters to get out of the way. Herron said he believes the protesters were afraid of trucks entering the facility.
Herron said at a news conference that the police and the sheriff's department have done a fantastic job and have supported the ongoing strike.
He said arrests take the union from his message.
At the same time, the strike of 49,000 United Auto Workers is starting to affect production in other countries.
|Ticker||Security||Last||Change||% Chg [1||GENERAL MOTORS COMPANY||38.18||-0.11||-0.29%  F||FORD MOTOR COMPANY||9.25||-0.03||-0.32% 19659019] FCAU||FIAT CHRYSLER AUTOMOBILES NV||13.71||0.00||0.00%|
spokesman Dan Flores confirms that the strike has forced GM to place about 1,200 workers on temporary notice at a Canadian factory that the company talks about making pickup.
The facility in Oshawa, Ontario, near Toronto makes th e previous generation Chevrolet Silverado and GMC Sierra full size trucks.
Silverado is GM's best-selling vehicle in the United States
The plant also makes the Chevrolet Impala a big car, and production has not been affected.  Flores says production will continue at two other Canadian factories that produce engines and the Chevrolet Equinox SUV.
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He says that lack of parts due to the strike has not affected production in Mexico.
The Associated Press contributed to this article.