JOHANNESBURG - Lawyers representing Jacques Pauw and Pieter-Louis Myburgh are demanding police explain their probe into the pair.
In a letter, the lawyers say they want the names of the complainants, details of the charges, and whether the NPA has decided to prosecute their clients.
The investigative journalists have been summoned to a meeting at Durban North Police Station.
Police have threatened to resort to legal avenues if the pair fail to appear.
Pauw and Myburgh both wrote books detailing the influence of the Guptas, and others, on South Africa's government.
The police have until 12 midday tomorrow to respond, failing which, the lawyers say they'll take legal action of their own.