Video: Brazilian father grabs gun from policeman trying to arrest his son and shoots him dead

This is the dramatic moment the father of a man police are trying to arrest grabs a loaded gun from the holster of the officer grappling with his son and shoots him dead.

Footage taken on a mobile phone shows Ismael Pereira de Souza , 49, snatching the pistol before starting a gunfight which ended with two men including the cop killer dead and two others injured.

The amazing sequence of events occurred after police ordered Ismael's son to turn down the music on his car speaker during a party in Itacaiu west of Goias in central west Brazil on Friday night.

He turned the sound up again as they left, sparking a wrestling match as they tried to detain him and put him in the back of their police car.

The home-made footage showed the officers grappling with the 29-year-old while an emotional woman thought to be a relative tried to stop them taking him away.

Ismael, who was wearing yellow shorts and a white T-shirt with black stripes, took advantage of the struggle to grab a gun belonging to one of the two officers who immediately realised his weapon had been taken from him and wheeled around to try to recover it.

In the ensuing gun-fight 15 shots were fired and policeman Uires Alves da Silva, 45, was shot and fell to the ground before his killer appeared to stand over him and kill him by firing at him from close range.

The officer's colleague, who was also injured, is believed to have fired back and killed Ismael as he tried to escape.

The killer's son was shot in the leg but survived and was arrested after hospital treatment on suspicion of homicide because police say he participated in the crime which led to the officer's murder.

The slain officer was due to be buried this morning/yesterday morning (SUN).

A police spokesman confirmed: 'Ismael's son had his music in his car on too loud. Police went to ask him to turn it down and he reduced the volume before putting it up again as they left.

'The police returned to the scene and a fight started.'

He added: 'After the officer was killed, his colleague Helio Bezerra de Souza was also shot by Ismael but managed to fire back at him and killed him.'

A police probe into the shocking incident was last night underway.