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. Last Updated: 07/27/2016

Prokhorov Aide Calls Inquiry Regrettable

The detention of Russian billionaire Mikhail Prokhorov in France last week as part of a prostitution investigation was a "regrettable misunderstanding," a spokesman for the metals executive said Monday.

Prokhorov was back at his desk Monday after four days of questioning by French police in connection with a probe into a prostitution ring, said Sergei Chernitsyn, a spokesman for Norilsk Nickel, where Prokhorov is a senior executive.

"His detention was the result of a regrettable misunderstanding," Chernitsyn said in a statement posted on the company's web site. "As planned ... Mikhail Prokhorov got back to his professional duties today after returning from his regular holidays," the statement said.

No charges have been brought against Prokhorov, who was released from police custody Friday after his detention in a raid at the Alpine ski resort of Courchevel.

Investigators suspect Russian call girls were brought to the resort and paid mainly with luxury gifts. Prokhorov and four others have been designated material witnesses in the case, which does not exclude future charges.

With a fortune of $6.4 billion, according to Forbes magazine, Prokhorov, 41, is one of the country's wealthiest men, largely thanks to his holding in Norilsk Nickel, the world's largest nickel producer, and Polyus Gold, Russia's biggest gold miner.