Eyewitness News has learnt police watchdog Ipid has secured a search warrant to inspect acting National Police Commissioner Khomotso Phahlane's house in the north of Pretoria.
The investigation relates to allegations of corruption during the period that Phahlane was head of forensic services.
Ipid also obtained a warning statement from the lieutenant general this morning, linked to a case of defeating the ends of justice.
Acting National Police Commissioner Phahlane has been under investigation, and is accused of defeating the ends of justice, after allegedly contacting witnesses who formed part of an Ipid probe about his R8 million mansion at an upmarket estate in Pretoria.
Forensic investigator Paul O'Sullivan opened the case against Phahlane almost a year ago.
O'Sullivan claims that the general lives in a house valued at about R8 million, but the value of his bond is far lower, and it appears he only paid R2.2 million for it.
It is understood that Phahlane allegedly interfered with witnesses who were being questioned in relation to that investigation.
Last year, O’Sullivan revealed that while the case was brought to the attention of senior police officials but claims that nothing was done.