Police are investigating the "disturbing" and "cowardly" torture and killing of two kangaroos in what senior officers have described as the worst act of animal cruelty they have ever seen.

Warning: This story contains content that may be distressing for some readers.

Key points: Footage of the violent acts of animal cruelty was found on a mobile phone

Footage of the violent acts of animal cruelty was found on a mobile phone The videos show two kangaroos being burnt, beaten, stabbed and shot

The videos show two kangaroos being burnt, beaten, stabbed and shot One man is helping officers with their inquiry, three others are yet to be identified

Videos obtained by police show a number of men torturing the kangaroos in two separate incidents, using a number of weapons including knuckle dusters, a rifle and knives.

Images have been released showing three men police believe can help with the investigation in the hope members of the public will be able to identify them.

Joondalup Police Detective Senior Sergeant Paul Giuffre said the footage of the violent incidents was distressing.

"I've seen the videos and honestly, in my 17 years of policing, it's one of the most disturbing things I have seen, hands down," he said.

"It's graphic, it's disturbing, it's cowardly."

The ABC decided not to publish heavily blurred versions of the videos released by police.

The kangaroos were killed in separate incidents in May and June this year. ( Flickr: Nicki )

In the first incident, captured on May 19, 2018, a small kangaroo is held down after it is suspected to have been burnt using an accelerant.

Men are then seen to repeatedly punch and stab the animal and can be heard laughing.

A second video, shot just minutes later, shows a man shoot the kangaroo in the head with what is suspected to be a .22 calibre firearm.

Just minutes after that video, the same mobile phone was used to capture photographs of men posing with knuckle dusters.

Men encourage attacker in second video

On the same mobile phone, a Snapchat video from June 16 shows another kangaroo being repeatedly stabbed by a man as it struggles to escape.

Men are heard laughing, swearing and encouraging the attacker before the animal is killed.

Police are asking for the public's help to identify the men. ( Supplied: WA Police )

A fourth man seen pixelated in the images released by police is assisting with inquiries but has not been charged.

He was arrested earlier this month in relation to another matter which is before the courts.

During that separate investigation, a mobile phone was seized and the videos of the animal cruelty were found on it.

The first man police are seeking is described as being 20-30 years old, fair skinned, of medium build and with dark facial hair.

He was wearing a black beanie with a white emblem on the front and a black hooded top.

The second man is described as between 25-30 years old, clean-shaven, fair skinned, of solid build and with short brown hair.

He was also wearing a black hooded top.

The third man is also described as between 25-30 years of age, fair skinned, of a medium build and with facial hair.

He wore a dark coloured top with an emblem on the front and writing on the sleeves.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or online.