The father of an IRA suspect shot dead by a Metropolitan Police officer in a raid on a west London house in 1996 has called on the British Home Secretary, Mr Jack Straw, to set up a public inquiry after yesterday's decision by the Crown Prosecution Service (CPS) not to bring charges against the officer.After "careful consideration", the CPS concluded there was insufficient evidence to prosecute the officer for any offence. Citing as an established principle of law that when someone honestly believed they were about to be attacked, even if that belief was mistaken, each individual was "entitled to use such force as is reasonably necessary to defend himself."Mr Diarmuid O'Neill's father, Mr Eoghan O'Neill, told The Irish Times his son's death was a "blatant example of the police being able to shoot first, ask questions later."In a statement, the CPS said the officer shot Mr O'Neill believing he was about to be shot and did so in self-defence: "His belief was mistaken, as Mr O'Neill was unarmed."Mr O'Neill was shot during a police security operation in the early hours of September 23rd, 1996, when armed officers surrounded a London guest-house.Two of the men arrested during the raid on the house, Brian McHugh and Patrick Kelly, were sentenced to 25 years and 20 years respectively in 1997 for conspiracy to cause explosions and having explosives.