Firefighters responded to the blaze, which started in a portable classroom at 55 Christen Ave., around 10:30 p.m., fire officials said.
Using hose lines, crews were able to contain the flames to the building and extinguish the fire. Firefighters worked on the scene until about midnight completing overhaul, fire officials said.
No one was injured in the fire, but its cause and the estimated damage to the school has not yet been determined.
