Trading in the business empire of Asia's richest man Gautam Adani was halted Friday following a 15 percent plunge in its share price, days after a US investment firm claimed it had committed "brazen" corporate fraud.

Flagship Adani Enterprises tumbled to 508.45 rupees ($6.23) in Mumbai in the afternoon, triggering an automatic 105-minute trading halt, while subsidiary Adani Total Gas also halted after it tanked 20 percent.