Johannesburg - A police officer accused of being part of a plot to kill detectives working on the Radovan Krejcir case appeared in the Alexandra Magistrate's Court, Johannesburg, on Friday, police said.

Sergeant Nandi Nkosi would remain in custody until her next appearance in the same court on Monday, Lt-Gen Solomon Makgale said.

She would then appear alongside four other people charged with conspiracy to murder, possession of unlicensed firearms, possession of unlicensed ammunition, possession of stolen vehicles, and theft.

Nkosi, 34, employed in the police's crime intelligence unit, was arrested on Thursday for allegedly providing software to track the investigators. Nine cellphones were confiscated from her.

Initially three men and a woman were arrested for allegedly plotting to kill forensic investigator Paul O'Sullivan and crime intelligence officer Colonel Nkosana “Killer” Ximba.

One of the men, Sibuniso Miya, was also linked to the kidnapping and attempted murder case for which Czech fugitive Krejcir is being investigated.

In addition to Krejcir the kidnapping case allegedly involves Sandton businessman Desai Luphondo, and two members of the Hawks - Warrant Officers Samuel Modise Maropeng and George Jeff Nthoroane.

Krejcir, Luphondo, Maropeng and Nthoroane were arrested in November.

In June, they allegedly kidnapped and assaulted a man whose brother, known only as “Doctor”, disappeared with a 25kg shipment of tik he had been recruited to help smuggle through OR Tambo International Airport.

They allegedly kept the man at Krejcir's Money Point business in Bedfordview, Johannesburg, for four days, and assaulted him.

Sapa