Shares of India's Adani Group firms fell between 1% and 2.5% on Tuesday, a day after the Wall Street Journal reported that U.S. prosecutors were probing whether Adani entities had imported Iranian LPG into India through their Mundra port.

The report adds to ongoing legal and regulatory pressures on the conglomerate. In a separate case last November, U.S. prosecutors indicted Gautam Adani and his nephew, Sagar Adani, over allegations of bribery in securing power contracts and misleading investors in the United States. The Adani Group has denied those charges.