Israeli authorities are investigating two senior lawmakers in what local media say are separate corruption cases.

The Justice Ministry says authorities are investigating Interior Minister Aryeh Deri concerning "matters," but did not elaborate.

It says there is also an investigation of opposition leader Isaac Herzog, head of the center-left Labor Party, over his involvement in recent party primaries, without elaborating.

Israeli media say police are investigating Herzog for possible illegal financing from interest groups.

Both politicians denied wrongdoing and said they would cooperate fully with the investigations.

Deri, of the ultra-Orthodox Jewish Shas party, was imprisoned in 2000 and served almost two years for accepting bribes when he previously served as interior minister.