CCTV captures moment WA police officer shoots man

A security camera has captured the moment a police officer opened fire at a young father in Western Australia.

Coen Rogers' mother is seen in the footage of her Pingelly front yard early on Sunday as she quietly tells a senior constable why she raised the alarm.

"He was just drinking and I told him to keep the noise down. Then he went off," his mother said.

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"He started grabbing knives and saying lots of stuff like he'd cut my throat and everything."

Her 28-year-old son then emerges, allegedly armed with two knives.

While most of the incident plays out off camera or on the very edge of the vision, the camera picked up the audio.

Rogers is accused of storming toward the officer, who draws and fires a Taser but fails to stop the man.

The officer then appears to fire a single shot, hitting the young father-of-one in the torso.

The officer immediately questions his move.

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"What have I done?" the constable can be heard saying, before he calls for an ambulance.

"Ambulance, he's bleeding, I shot, I shot someone."

The constable was responding alone, with his partner on sick leave and back-up 20 minutes away.

The incident sparked controversy about regional police resourcing.

Rogers' cousin revealed the normally gentle FIFO worker snapped after he received news his grandmother had suffered a stroke.

"Coen is such a happy go lucky person," Kellee Gillespie said.

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"He's never been a violent person, he's just always the party."

Both Rogers and his grandmother are recovering in Royal Perth Hospital.

Surgery is needed for his bullet wound, while an inquiry determines whether the officer did the right thing.

The family believes he did.

"The police and the town is just so understanding and we all get along," Gillespie said.