Disturbing details have emerged of the brutal torture and killing of two kangaroos at the hands of a group of laughing young men.

Three men are still wanted by police over the horrific attack which was filmed on a mobile phone and recovered by police.

The videos, which were filmed on May 19 and June 16, show the kangaroos being repeatedly stabbed and punched with knuckledusters while their attackers laugh.

One of the animals is seen smouldering from being torched by the men and is shot in the head with a rifle at close range.

In a final sickening act, the men are filmed spitting on the roos after their deaths.

Detectives investigating the incident would not release the footage because of the graphic nature but said it was one of the most horrific and sickening instances of animal cruelty they had ever seen.

Officers have identified one man but say three others are still at large. He is helping police with their investigations and has not been charged.

The men wanted by police are described as being fair-skinned. Two of the men had facial hair and one was clean shaven.

One of the unshaven men was wearing a black beanie with a white emblem on the front and a black hooded top and the other was wearing a dark-coloured top with an emblem on the front and writing on the sleeves.

The clean shaven man was wearing a black hooded top.

Anyone who recognises them is asked to contact Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.