Ali told newsmen that himself and other young boys were abducted from Konduga after an attack carried out by the group.
He said during his stay with the group, he was trained in the use of assault rifles and other dangerous weapons which he used to execute his victims.
“I was forced to join Boko Haram about three years ago. Boko Haram insurgents came to our village and forcefully took many of us away. We were kept in the bush camp near Kala Balge and from there we carried out various operations, during which I personally killed 18 persons. I can handle all kinds of guns including AK-47 and AA (anti aircraft) rifle”.
Ali said he ran away from the group recently when himself and two others were sent to spy on the city for a possible attack.
“I was tired of killing people against my wish, so I told my two other colleagues with whom we were asked to go on a spying mission that we should abandon the mission and run. So I came to Maiduguri to search for my parents in the camps.
But some IDPs who knew me as member of Boko Haram decided to report me to the security people” he said.