Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Three of Northern Ireland's most senior police officers are under investigation for alleged misconduct in public office and criminality that could amount to conspiracy to pervert the course of justice.

Chief Constable Hamilton investigated by ombudsman