Johannesburg - The trial of Johannes Jacobus Steyn, dubbed the “Sunday rapist”, is set to continue in the High Court, sitting in the Palm Ridge Magistrate's Court in Alberton, on Friday.

On Thursday, a forensic expert corroborated evidence that cellphones belonging to Steyn were used in areas where his alleged victims were abducted.

Lieutenant Colonel Andre Neethling testified about the locations of two cellphones on the day school girl Louise de Waal was kidnapped and murdered.

Steyn is accused of murdering De Waal and Lazanne Farmer. He is also charged with 11 counts of rape, 10 of sexual assault, 10 of kidnapping, one of attempted sexual assault, one of attempted kidnapping, and two of assault.

He pleaded not guilty to all 37 charges against him.

Seven of his alleged victims had testified so far. Most were aged between 15 and 18 when he allegedly forced them into his bakkie at gunpoint on Sunday mornings between 2008 and 2011, drove off with them, and raped or sexually assaulted them.

Vodacom employee Petro Heyneke told the court the GPS signal on both of Steyn's cellphones registered at towers in Danville and Roodepoort on the days and times when Farmer and De Waal were abducted.

The cellphones also registered at eight other locations where the other victims were taken. - Sapa