Johannesburg - Czech fugitive Radovan Krejcir and six others appeared in the Alexandra Magistrate's Court in Johannesburg on Monday for conspiring to commit murder, police said.
The matter was postponed to April 22 for further investigations, Lt-Gen Solomon Makgale said.
“There are still one or two more people that we believe have been involved. We are at an advanced stage of our investigations and we believe that an arrest will be made soon.”
A seventh person linked to Krejcir's criminal investigation was arrested two weeks ago.
Makgale said at the time that 33-year-old Welcome Nkanyiso Mafunda was charged with conspiracy.
“This accused is alleged to have been part of a group that conspired to kill [police] Colonel Ximba and [investigator] Paul O'Sullivan earlier this year,” said Makgale.
The two men had been investigating Krejcir.
The first four suspects, Sboniso Miya, Zoduma Biyela, Jacob Nare and Owen Serero, were arrested on January 9.
“Subsequent to that, one female police sergeant Nandi Nkosi and Radovan Krecjir [were arrested],” Makgale said.
Krejcir was charged with conspiracy to commit murder three weeks ago.
One of the men was also linked to the kidnapping and attempted murder case for which Krejcir is being investigated.
The kidnapping case allegedly involves Krejcir, Sandton businessman Desai Luphondo, and two members of the Hawks - Warrant Officers Samuel Modise Maropeng and George Jeff Nthoroane.
They 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.