The world was a very different place in 1966 when three unarmed police officers were shot dead in west London.
Such violent crimes were relatively unheard of and shockwaves reverberated across a nation which had been celebrating England's World Cup victory just two weeks previously.
Harry Roberts, who shot two of the men, would be given three life sentences for his role in the crime - but only after sparking a massive manhunt.
Britain's outrage and sorrow were illustrated by the thousands who lined the streets for the officers' funeral.
Members of the public openly wept for the occupants of the unmarked police vehicle, call sign Foxtrot One One, killed in the line of duty.
Months on the run
Roberts had been sitting in a parked van in Braybrook Street, near Wormwood Scrubs, at about 3.15pm on 12 August 1966 after taking part in an armed robbery when they were spotted by the three officers.
Sgt Christopher Head, 30, and Det Con David Wombwell, 25, approached John Witney, the driver of the vehicle, to ask him about his driving documents.
As Det Con Wombwell was writing in his notebook, Roberts - the front seat passenger - took out a Luger pistol and shot him.
Sgt Head ran back towards the police car but he too was shot by Roberts. Their colleague PC Geoffrey Fox, 41, was killed by fellow gang member John Duddy.
Roberts went on the run - evading police for three months by camping out in Epping Forest, Essex, using the survival training he had learned in Malaya while serving in the Army.
Meanwhile, around the country police were trying to track him down in the biggest manhunt Scotland Yard had ever carried out. Wanted posters bearing Roberts' image - and promising a £1,000 reward - were put up.
His mother Dorothy made an emotional televised plea for him to turn himself in, saying directly to her son: "I ask you from the bottom of my heart to come into the open and give yourself up. If you make an appointment with me, I will come with you.
"The whole thing is killing me. Please do as I ask you before there's any more blood shed."
When he was eventually apprehended, Roberts seemed grateful to the police, according to a senior Hertfordshire Police officer who had been on the raid.
Press Association reporter Peter Woodman, whose parents were friends with the officer, said: "He [Roberts] was surprised that he was merely arrested as he thought the police would kill him on the spot."
