Journalists have protested outside the headquarters of South Africa's state broadcaster against what they allege is censorship in its news reporting.

Protesters on Friday marched to the Constitutional Court to deliver a complaint about what they say is the illegal conduct of management at the South African Broadcasting Corporation. Some put tape over their mouths to symbolize the alleged lack of media freedom.

South African media say the protesters object to the suspension of three SABC employees who wanted to cover a protest outside the state broadcaster's offices last week.

SABC also barred its journalists from broadcasting footage of rioting last week in some parts of the capital, Pretoria.

SABC head Hlaudi Motsoeneng has denied censorship allegations.