Updated

An Israeli court has released four of the seven suspects held in a high-profile corruption case involving Prime Minister Benjamin Netanyahu's confidants after a judge apparently discussed their detention with an investigator.

The development leaves two Netanyahu aides — Nir Hefetz, the premier's former media adviser, and Communications Ministry Director Shlomo Filber — and media tycoon Shaul Elovitch in jail.

Israeli media reported late on Sunday that Tel Aviv District Court Judge Ronit Poznanski-Katz and an investigator from the security agencies exchanged messages about the suspects held in a case involving Netanyahu's aides and telecom giant Bezeq.

Last week police arrested Elovitch and the others over involvement in promoting regulations worth hundreds of millions of dollars to Israel's Bezeq telecom company, of which Elovitch is a major shareholder.