A 4-alarm fire at a former school in Fitchburg, Massachusetts was intentionally set, according to the state's fire marshal.
The fire broke out at 52 Academy Street, the former B.F. Brown Middle School building, just before 4 a.m.
One Leominster firefighter was injured in the blaze.
Fitchburg Schools cancelled classes at nearby Longsjo Middle School because of the fire.
Fitchburg Fire Chief Kevin D. Roy is urging anyone who saw or heard anything, to call the confidential, toll-free Arson Hotline at 1-800-682-9229. The hotline is part of the Arson Watch Reward Program which provides rewards of up TO $5,000.
