Nigeria’s anti-graft agency said it traced at least $615 million of allegedly illegally acquired cash and properties to the West Africa nation’s former oil minister, Diezani Alison-Madueke.

In addition to “boxes of gold, silver and diamond jewelry, worth several million pounds” found at her residence, the Economic and Financial Crimes Commission identified more than a dozen buildings across the country worth more than $500 million owned by the former minister, the agency said in a statement on its website on Wednesday.

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