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Rickmers, which manages the ship for Maersk said Iranian navy fired "warning shots" at Marshall Islands-flagged Maersk Tigris.
Freight forwarding and logistics subsidiary CMA CGM LOG plans to expand into a dozen countries this year.
XPO's purchase of the French 3PL is the company's first international acquisition and gives it a strong foothold in the European market.
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.
The truckload freight and logistics provider had net profits of $21.8 million in first quarter 2015.