'Mthethwa must answer for Marikana'
The Socio-Economic Institute says Mthethwa should be questioned at the Marikana commission.
The SERI has raised concerns that cabinet ministers will not be required to testify at the commission.
The commission's new terms of reference have been amended and a clause indicates that ministers may not be called to the stand.
Forty-four were killed in violence at the North West platinum mine in August 2012.
The institute's Kate Tissington says, "We've always felt that the minister of police, at least, and a number of other cabinet ministers potentially and Cyril Ramaphosa should come before the commission and talk about some of the implications of their involvement."
Watch: Marikana votes for change