CAPE TOWN - The Police and Prisons Civil Rights Union (Popcru) on Friday called on the public to come forward with any information relating to the murder of a constable.
Yanga Tshefu was shot dead while sleeping in his home in Makhaza earlier on Friday.
The three suspects shot him before fleeing the scene with two cellphones.
Popcru's Mncendisi Mbolekwa said the union was shocked and called on officials to charge suspects with high treason.
Earlier this week, National Police Commissioner Riah Phiyega said police killings were a major concern.
At least one police officer is killed in South Africa every 10 days.
Phiyega called on communities to help protect members of the South African Police Service (SAPS).
Earlier this week, two police officers were killed by demonstrators at Lonmin’s Marikana mine in the North West Province.
(Edited by Lindiwe Mlandu)