Investigators in India will visit a vast private zoo owned by the billionaire Ambani family, after the Supreme Court ordered an inquiry into allegations that animals were acquired unlawfully and mistreated.

The inquiry will also examine possible violations of wildlife laws at Vantara, as well as allegations of financial irregularities and money laundering.

The Supreme Court said there was no proof to support the allegations but ordered an inquiry because authorities had been accused of failing in their duties.

Vantara, run by Anant Ambani - son of Asia's richest man Mukesh Ambani - is home to hundreds of elephants, tigers and other animals. It has promised full co-operation with the inquiry.

"Vantara remains committed to transparency, compassion and full compliance with the law. Our mission and focus continues to be the rescue, rehabilitation and care of animals," it said, without directly commenting on the allegations.