Crimestoppers is offering a reward of up to £5,000 for information regarding an arson attack on Coed Eva primary school in Cwmbran.
The blaze, which broke out in the early hours of New Year's Day destroyed the nursery and infant classrooms.
Read more: Criminals target blaze hit primary school
Around 200 nursery and infant pupils were left without a classroom and more than 500 pupils were forced to take an extra week off following the fire.
Seven people from the area are currently on bail after they were arrested on suspicion of arson with intent to endanger life.
The independent charity says it believes there are people in the community who hold vital information that could help secure a conviction.