Prime Minister Benjamin Netanyahu underwent a new round of questioning on Friday over one of several graft cases that have threatened to topple him, Israeli media reported.The prime minister has not been charged in any of the cases.
Netanyahu has been repeatedly questioned over allegations involving Israeli telecoms giant Bezeq and its largest shareholder, Shaul Elovitch.
The premier is accused of seeking favourable coverage from another Elovitch company, the Walla news site, in exchange for policies that could have benefited the mogul's interests to the tune of hundreds of millions of dollars.
Netanyahu also faces interrogation as a witness in a case involving the purchase of three German submarines.
Israeli television on Friday showed footage of police officers arriving at his office.
The police and Netanyahu's office never confirm he is being questioned until the hearings are over.
Israeli media reported that Friday's questioning will for the first time cover two further cases in which he is suspected of corruption, fraud and breach of trust.
In one, he and family members are suspected of receiving around 1 million shekels ($275,000) worth of luxury cigars, bottles of champagne and jewellery in exchange for financial or personal favours.
In the second, he is suspected of seeking a deal for positive coverage from Israel's top-selling daily newspaper, Yediot Aharonot, in exchange for advancing a law that would have limited the circulation of Israel Hayom, a free competitor.
His wife Sara appears in court on Sunday charged with misusing state funds to buy catered meals costing $100,000 (85,000 euros) by falsely declaring there were no cooks available at the premier's official residence.
Netanyahu, prime minister for around 12 years in total and with no rival in sight, has maintained his innocence in all the cases.
But the investigations have gradually ratcheted up speculation over whether he will eventually be forced from office.
So far his coalition partners have stood by him despite the allegations. He is not obliged to step down as prime minister even if he is formally charged.