Indian firm Cyril Amarchand Mangaldas, the largest law firm in India, was raided in late February by government authorities in connection with one of the largest cases of bank fraud in the country, according to media reports.

The Central Bureau of Investigation of India—the nation’s equivalent of the FBI in the United States—visited Cyril Amarchand’s head office in Mumbai last week and took documents related to firm client Nirav Modi, a billionaire jeweler, local press outlets Legally India and Bar & Bench reported.