Ten men implicated in an attempted robbery at the Emperors Palace casino appeared in the Kempton Park Magistrate's Court on Tuesday.
The matter was postponed to May 6, when three of the accused were expected to have arranged legal representation.
Lt-Col Lungelo Dlamini said 15 men were arrested for the foiled robbery at the casino on Sunday, but three were later released.
"We found that the three were not part of the gang that tried to rob the casino and they were simply there for their own personal reasons."
Two of the remaining 12 were still in hospital after they were injured during a shoot-out with police.
"They are still recovering at the Tembisa Hospital," said Dlamini.
Police received a tip-off that a gang was planning to rob the gambling spot. Police confronted the men at the casino's entrance and a shoot-out ensued.
Three AK-47 assault rifles, four pistols, and one revolver were recovered.
The 12 face charges of conspiracy to commit a robbery, attempted murder, possession of unlicensed firearms, and possession of suspected stolen vehicles.