The action came after the revelation by Avtar Singh, a suspected terrorist and member of Bhindrwale Tiger Force -- who was allegedly involved in the recent Rs one crore rupee heist of Karol Bagh, sources said.
Singh, who was arrested by the Central district's police on Friday told his interrogators that he was nabbed by the Special Investigation Team (SIT) of Delhi police's Crime Branch last week.
But he was allowed to go scot free after he paid Rs 5 lakh to a sub-inspector of SIT from the booty, sources said.
If the allegations are found true, they may face strict disciplinary as well as legal action.
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According to sources, it was constable Parvez Alam, who had received tip-off about the gang after which the robbery was worked out by the Crime Branch.
Police has also learnt from Jugal, who was also arrested in this case that he had handed over the robbed booty to one Assistant Commissioner of Police on the assurance that he will be saved.
Role of the ACP was also being probed in this connection.
Although top police officials refrained to comment over the issue, a senior police officer of the Crime Branch refuted the allegations and claimed that around nine persons were apprehended by SIT but only five of them were found involved in the crime after which others were allowed to go.
Initially, six people, including a receiver were arrested by the Crime Branch while Avtar Singh and his three associates where arrested later by the Central Delhi police in this connection.
Two of the miscreants got down from the motorcycles and one of them broke the window shield of the vehicle.
After assaulting the occupants of the car, they took away the bag containing jewellery and cash at gun point before fleeing from the scene.