The attack on the victims by the Katsina State residents was reportedly because the pair, a male and female, lived together.
Another corps member, Ikenna Adol Madu posted gory pictures of the attack on his colleagues via Facebook.
He explained that the cohabitation between the victims angered their assaulters who considered the act of unmarried opposite sex individuals living together as a crime.
Graphic images showed deep cuts on the head of the male victim, while the female had her thumb severed off her hand.
This action has generated widespread criticism from NYSC members who condemned the behaviour of the indigenes of the state.
The incident is an example of some of the religious fanaticism observed in the Muslims dominated northern Nigeria.