Students Mabelle B. Avery Middle School in Somers were dismissed early Monday after firefighters responded to a report of smoke in the front of the school.
The Somers Fire Department responded at 1:37 p.m. to the school after getting a report of smoke in the school's foyer, said Deputy Chief Frank Falcone.
School officials told NBC Connecticut that the students and staff were evacuated to nearby Somers High School and were kept briefly in an auditorium.
They were then dismissed along with the high school students and were able to get back to the middle school to get their belongings, the news station reported.
Falcone told Patch the smoke wasn't anything toxic and it didn't escape beyond the foyer area. He said officials believe it was caused by a malfunctioning heating unit, likely a motor, that overheated.