The Police Federation has asked the ombudsman's office to carry out a leak inquiry following a BBC story on the fatal shooting of Stephen Colwell.
The police shot dead Steven Colwell at a checkpoint
Mr Colwell, 23, was shot by an officer in Ballynahinch on Easter Sunday.
The report on Friday gave details of the officer's claim that he shot Mr Colwell because he believed he was deliberately trying to run him over.
The Federation said the detail in the report should not have gone beyond the ombudsman's office or the PSNI.
The policeman involved told the police ombudsman's office he shot a man driving a stolen car in County Down because he believed his life was in imminent danger.
Mr Colwell was shot at a checkpoint just outside the police station in Church Street in Ballynahinch.
The BBC has also learned that passengers in the rear of the car narrowly escaped being shot as well.
The officer, who has more than 10 years' experience, has said he fired directly through the windscreen, it is believed.
However, it is also understood the ombudsman's team believe one of the two rounds fired came through the window on the driver's side.
It has also emerged that the person sitting directly behind Mr Colwell narrowly escaped being shot.
At least one bullet was found in the car boot, having passed through both the driver's and rear passenger seats.
Police fired a number of shots at the stolen car containing six people after they apparently refused to stop at a checkpoint.
Mr Colwell had an address in Main Street, Cullybackey, but was originally from Belfast.
Three men and two women who were also in the car have been released on bail and have been questioned by the ombudsman.