Police suspect Elovitch's business was given regulatory breaks in return for Netanyahu receiving positive coverage on Walla!, a news website he owns.
Hefetz is alleged to have acted as a messenger between Netanyahu, Bezeq and Walla! officials.
He is also suspected of trying to bribe a retired judge to block a probe into the prime minister's wife, Sara Netanyahu, over alleged misuse of public funds.
Police are not divulging details of the probe but Israeli media said that police and Securities Authority investigators on Friday carried out a carefully orchestrated simultaneous interrogation of six suspects at different locations to prevent them coordinating their testimonies.
Top-selling daily Yediot Aharonot said while Netanyahu was being questioned for five hours at his official Jerusalem residence, Sara was being grilled at national fraud squad headquarters near Tel Aviv.
Elsewhere in the same police building, it said, Hefetz and Elovitch were under interrogation, along with Elovitch's wife Iris and a former senior communications ministry official, whose name is subject to a court gag order.
All were placed in separate rooms, it said.
"Detectives who were sitting in a forward command post continually received updates in real time from the six separate interrogations and steered the complex operation," the paper added.
"They fed questions to the detectives in the interview rooms and tried to find holes in the answers that were received."
http://www.france24.com/en/20180304-ex-netanyahu-aide-released-put-under-house-arrest
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