Israeli police have questioned Prime Minister Benjamin Netanyahu over his alleged dealings with the country's largest telecommunication company, Israel Radio said on Monday, in one of three corruption cases weighing on the leader's political future.

It was the second time the prime minister had been questioned in the investigation. He is suspected of awarding regulatory favours to Bezeq Telecom Israel in return for favourable coverage on a news site the company's owner controls.

Netanyahu has denied any wrongdoing and says he is the victim of a "witch-hunt".

Family questioned

Israeli media said Netanyahu's wife and son would be questioned separately in the telecoms investigation over their relationship with Bezeq's owner and his spouse.

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Video footage showed a police car pulling into the driveway of the prime minister's official residence in Jerusalem. A police spokesman and a lawyer for the Netanyahu family declined to comment.

Bezeq has denied wrongdoing. Police have yet to make a recommendation about charges in the case.

Two former Netanyahu confidants have agreed to turn state's witness in the case. One is Shlomo Filber, the former director general of the Communications Ministry; the other is Nir Hefetz, a former spokesman of Netanyahu.

In the two other cases in which police have already recommended that Netanyahu be charged with bribery, the final decision about whether to prosecute rests with the Israeli attorney general. That decision could be months away.

In the first investigation, known as Case 1000, he is suspected of bribery over gifts from wealthy businessmen, which police say were worth nearly $300,000.

The other, Case 2000, involves an alleged plot to win positive coverage in Israel's biggest newspaper by offering to take measures to curtail the circulation of a rival daily.

Support

So far, partners in Netanyahu's governing coalition have stood by him, saying they are awaiting the attorney general's next moves. Political analysts say such support may erode if the investigations against Netanyahu intensify.

Netanyahu could also call a snap election to try to stall legal proceedings during the campaign and rally his right-wing power base behind him. Recent polls show Netanyahu's Likud ahead of other factions in the Knesset.

However, surveys also show that about half of Israelis believe the police over Netanyahu and think he should step down. A third think he should remain in office.