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The truck drivers are targeting four companies for now, but may expand the strike, according to Teamsters spokeswoman Barb Maynard.
Bad shipper experience could result in long-term cargo diversion, according to port economist John Martin.
Nebraska Sen. Deb Fischer says labor impasse sent "ripples through the U.S. economy."
The U.S. Naval Institute has confirmed Iranian navy vessels shot at the Marshall Islands-flagged Maersk Tigris, which is chartered to Maersk Line by Rickmers.
Los Angeles Mayor Eric Garcetti's office says there are "plenty of trucks and drivers."
More needs to be done about these "unfair and unreasonable" fees, according to a joint letter from 94 industry organizations.