Around 40 French museums were affected by a ransomware attack over the weekend, according to news agency Agence France-Presse (AFP).

Among the affected organisations was the Grand Palais, which is hosting Olympic events in Paris.

A police source told AFP that those responsible attacked a system that centralises financial data for affected organisations, demanding a ransom and threatening to release financial data.

France's national cybersecurity agency, ANSSI, confirmed that it had been alerted to an incident.