Civil rights groups are calling for a boycott of Sunday's Oscars ceremony in Los Angeles to demand more diversity among Academy Awards voters after no actors from ethnic minority groups earned nominations this year, organizers said on Friday.

Activist and political commentator Al Sharpton's National Action Network, civil rights group Southern Christian Leadership Conference and the Los Angeles Urban Policy Roundtable said they would demonstrate on Sunday before the televised ceremony.

"We are calling for a boycott of Sunday's Academy Awards ceremony," National Action Network political director Najee Ali said at a news conference. "We believe the Oscars needs more diversity within its membership."