Police grilled Israeli Prime Minister Benjamin Netanyahu for three hours on Monday on suspicion of receiving gifts from businessmen, as part of a graft probe that has shaken the country's politics.

Investigators quizzed Netanyahu at his residence in central Jerusalem under caution "on suspicion of receiving benefits", a police spokesman said afterward, adding there were no further details to give.

Ahead of the questioning, Netanyahu denied any wrongdoing and told his political opponents to put any "celebrations" on hold.