Israeli police have questioned Prime Minister Mr Ariel Sharon's elder son, Omri, for nine hours in a corruption investigation.
A police spokesman confirmed Mr Omri Sharon, an MP of the ruling Likud Party, was questioned but gave no details.
In the coming weeks, the Prime Minister is also likely to be interrogated, the Haaretznewspaper's website reported. Mr Sharon has denied wrongdoing.
Omri Sharon was questioned by police before in relation to a case that dates back to October 2001.
At the time, Israel's state comptroller said Omri Sharon improperly raised money outside Israel from a company called Annex Research for his father's successful 1999 campaign to win the Likud leadership.
The comptroller asked Sharon to reimburse the company $980,000 (about £600,000) that it paid his campaign. The prime minister repaid the loan.
However, police are now investigating how the Sharon family received the money to return the loan.
Police are investigating a transfer of US 1.5 million by South African businessman Mr Cyril Kern to Omri Sharon and his younger brother, Gilad. Mr Kern's money allegedly served as collateral for a loan obtained from a different Israeli bank to repay Annex.
Israel's Justice Ministry has asked the South African authorities to assist it in investigating the allegations.
AP