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Rickmers, which manages the ship for Maersk said Iranian navy fired "warning shots" at Marshall Islands-flagged Maersk Tigris.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
U.S. Naval Forces Central Command has begun accompanying U.S.-flagged maritime traffic in the Strait of Hormuz.
Transportation and port companies need to cooperate more, members of the Agriculture Transportation Coalition said at their annual meeting in San Francisco.
Canadian National, Canadian Pacific and Union Pacific railways have seen volumes drop 4 percent, 3 percent and 6 percent, respectively, so far in the second quarter.
The ever-increasing size of containerships has led a decrease in average number of containers moved per hour in port and, in turn, to increased vessel delays, according to a new JOC Port Productivity study from IHS Inc.