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Rickmers, which manages the ship for Maersk said Iranian navy fired "warning shots" at Marshall Islands-flagged Maersk Tigris.
U.S. Naval Forces Central Command has begun accompanying U.S.-flagged maritime traffic in the Strait of Hormuz.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
Announced on the heels of a port driver labor strike, Eco Flow will use "free-flow" to move containers out of terminals to off-dock yards.
Oil executive quoted as saying ship will be sold unless $10 million paid.
Such an alliance could have a "competitive edge," according to industry consultant Drewry.