Two "cowardly" teenage boys who used a dating app to target gay men in violent ambushes, including one victim who was tasered and had teeth knocked out, have been sentenced to juvenile detention.

The pair were part of a group of seven teenagers charged over the string of assaults, in which the offenders armed themselves with knives, machetes and a taser.

Details of the attacks were outlined in the Perth Children's Court today, when the now 18-year-old and 16-year-old appeared for sentencing.

The court heard the oldest boy was involved in one of the most serious attacks, in which a 30-year-old man was tasered and had his teeth knocked out.

The victim was also detained against his will and forced to undress, before running from the group and hiding in the weeds of a nearby swamp until th

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