OFFICIAL police records are under-reporting some crimes - including assaults - with the public distrustful that the records reveal the true extent of crime in Victoria.

A scathing Ombudsman's report also found some police were misusing procedures to boost the number of crimes declared solved. It detailed how some offenders had unrelated offences added to their file to "clear up" more crime.

The matter of clearing crime has been referred to the Office of Police Integrity.

The report, tabled in parliament yesterday, also found:

? Police have antiquated, ad hoc administrative practices for recording crime.