The home of former interior minister Arsen Avakov was also searched, as part of the apparent purge. In a statement that made no mention of the tycoon, the economic security bureau said it had exposed large-scale embezzlement schemes and tax evasion worth 40bn hyrivnia ($1bn; £880m) by the former management of Ukraine's two biggest oil firms, Ukranafta and Ukrtatnafta. MP Oleksiy Honcharenko said the acting head and two deputies had been fired