French prosecutors said on Monday that the police had arrested seven people over the weekend in connection with the kidnapping of the father of a cryptocurrency entrepreneur, adding that the captive had been freed.

In a statement, the Paris prosecutor’s office said it had been informed on Thursday that a man had been kidnapped in Paris and held with “a ransom demand.” The office did not name the kidnapped man.

The captive, who had been held in a home in Essonne, an area to the south of Paris, was freed by the police on Saturday evening, the statement said. It added, without providing further details, that the man was injured and had been taken for medical treatment.