The Trump Organization, the conglomerate owned by the family of former US President Donald Trump, is under criminal investigation, the New York State prosecutor announced on Tuesday.

The Trump Organization, the conglomerate owned by the family of former US President Donald Trump, is under criminal investigation, the New York State prosecutor announced on Tuesday.

"We have informed the Trump Organization that our investigation into this organization is no longer solely of a civilian nature," said a spokesperson for Prosecutor Leitia James.

"We are now actively investigating the Trump Organization in criminal matters, together with the Manhattan prosecutor," she added.