A prosecutor has referred Algeria's former prime minister Ahmed Ouyahia, along with a minister and two ex-ministers, to the Supreme Court over graft accusations in an ongoing crackdown on the former ruling elite, authorities said on Wednesday.

Algeria's former finance minister Karim Djoudi appeared before the Supreme Court on Sunday to face questions about corruption accusations, state television reported.

Algeria on Sunday postponed disputed presidential polls, which were scheduled for next month, after the sole two hopefuls were disqualified.

Algeria's imminent presidential election looks likely to be postponed, a source said on Friday, as protesters returned to the streets for the 13th successive Friday to demand the removal of the nation's ruling elite.

Five Algerian billionaires, some of them close to former president Abdelaziz Bouteflika who quit over mass protests, have been arrested as part of an anti-graft investigation, Algerian state TV said on Monday.

Huge crowds of protesters filled central Algiers for a ninth weekly mass rally Friday, galvanised by the departure of long-time president Abdelaziz Bouteflika but vowing to keep up their demands for sweeping reforms.

In yet more upheaval for Algeria since the ousting of long-time leader Abdelaziz Bouteflika, the controversial head of the country's constitutional council quit Tuesday bowing to weeks of anger from protesters.

Algerian lawmakers appointed a regime stalwart as the country's first new president in two decades Tuesday, dismaying protesters seeking sweeping change following the resignation of veteran leader Abdelaziz Bouteflika.

Algeria's parliament appointed on Tuesday its upper house chairman Abdelkader Bensalah as interim president following the resignation of Abdelaziz Bouteflika after weeks of mass protests against his rule.

Algerian President Abdelaziz Bouteflika's decision to quit by April 28 "will change nothing" and demonstrations will continue, a protest leader said on Tuesday, indicating popular pressure for more far-reaching political change remains insistent.

Algeria's President Abdelaziz Bouteflika will resign before his mandate expires on April 28, his office said on Monday, after a succession of loyalists deserted the ailing leader in recent days.

Hundreds of Algerian lawyers protested again on Saturday in the capital to demand the immediate resignation of President Abdelaziz Bouteflika who has been for 20 years in power.