Johannesburg – The Police and Prisons Civil Rights Union (Popcru) has expressed sadness at the "senseless" killing of Provincial inspector AB Nkumba, who was shot dead while on duty in Standerton, Mpumalanga, it said on Tuesday. Nkumba was shot on Friday when he stopped a vehicle for a traffic violation, said spokesperson Richard Mamabolo. On Satursday, Free State police said they arrested three people, including a 20-year-old woman, in connection with the murder. The three were arrested on Friday evening while trying to enter Lesotho at the Maseru border post after a car fitting the description of the one the killers had used, was stopped and searched. Police found a RAP 401 handgun with live ammunition and a traffic fine receipt book the three had allegedly stole from the officer. The suspects appeared in the Ladybrand Magistrate's Courts on Monday, and they would appear in the Standerton Magistrate's court on Wednesday, said Mamabolo.Popcru members will be gathering outside the court from 08:00 on Wednesday for a picket calling for an end to police killings and for bail to be denied."We have seen a rise in police killings over the past month, with many kids becoming orphaned and wives widowed, and want to reiterate our call that police officers must act decisively when confronted by such criminal elements," said Mamabolo.