Wednesday, 27 February 2008, 17:15 GMT

JOHANNESBURG, South Africa (CNN) -- White students at a South African university tricked black residence hall workers into eating stew containing urine, prompting a march Wednesday in which five people were arrested, university officials said.

Students protest against a racist video on the campus of Free State University in Bloemfontein, South Africa.

The white students made a video of the incident, which they staged in reaction to the university's efforts to integrate its residences, according to a statement from the University of the Free State.

The protesters on Wednesday included black and white students who later marched to the residence where the video was made and demanded that it be shut down, witnesses said.

The video surfaced on Tuesday but was made in September, the university said.