The strike against General Motors is now in its fourth day.
Tensions are rising as United Auto Workers officially says seven to nine union pickers have been arrested for blocking a roadway at a GM plant in Tennessee.
The arrests came Wednesday at the Spring Hill plant, according to Local UAW Chairman Mike Herron.
Authorities asked protesters multiple times to get out of the road. Herron said he believed the protesters were fighting trucks might get into the plant.
Heron said at a news conference that police and the sheriff's department had a fantastic job and were supportive during the ongoing strike.
He said arrests
Meanwhile, the strike by 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||-0.32 19659019] FCAU||FIAT CHRYSLER AUTOMOBILES NV||13.71||0.00||0.00%|
Company spokesman Dan Flores confirms that the strike has forced GM to place about 1,200 workers on temporary layoffs at a Canadian factory that makes pickup trucks.
The plant in Oshawa, Ontario, near Toronto makes th e previous generation Chevrolet Silverado and GMC Sierra full-size pickups.
The Silverado is GM's top-selling vehicle in the US
The plant also makes the Chevrolet Impala a large car, and that production has not been affected.  Flores says production continues at two other Canadian plants that make engines and the Chevrolet Equinox SUV.
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He says parts shortages due to the strike have not been affected production in Mexico.
The Associated Press has contributed to this article.