A ransomware attack that hit ION Trading UK could take days to fix, leaving many brokers unable to process derivatives trades, sources familiar with the matter told Reuters on Thursday.

ION Group, the financial data firm’s parent company, said in a statement on its website that the attack began on Tuesday. “The incident occurred in a specific environment, all affected servers have been taken offline and the repair of services is ongoing,” ION Group said, declining requests for further comment, reports Reuters, reports Infinitysec.

Ransomware is a form of malicious software deployed by criminal gangs that works by encrypting data, with hackers offering the victim a key in exchange for payment. Such ransom demands can reach millions of dollars.

Officials on both sides of the Atlantic are monitoring the rift. “We are aware of this ongoing incident and we will continue to work with our counterparts and the firms affected,” Britain’s Financial Conduct Authority (FCA) and Prudential Regulation Authority (PRA) said on Thursday. The Federal Bureau of Investigation told Reuters it was also aware of the hack, although it declined further comment. Bloomberg News reported that the FBI had been in contact with ION executives about the incident.

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