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The truck drivers are targeting four companies for now, but may expand the strike, according to Teamsters spokeswoman Barb Maynard.
Nebraska Sen. Deb Fischer says labor impasse sent "ripples through the U.S. economy."
Schnitzer Steel and Bed Bath & Beyond say the labor slowdown and resulting port congestion hurt business.
Chicago-based SEKO has expanded in recent years into a full-service logistics provider with transportation, warehousing, supply chain, home delivery and e-commerce capabilities.
Crew on Maersk Tigris remains safe and are in good spirits, according to the Danish ocean carrier.
Grand Alliance chassis pool will be terminated and Direct ChassisLink will contribute those assets to its expanded pool.