Students were dismissed early from Northeast Metro Tech in Wakefield, Mass. Thursday after the discovery of what appeared to be a Molotov cocktail in a school conference room, according to school officials.
According to a notice on the school website, at the beginning of the school day officials found a broken window in a school conference room and called police.
Investigators said someone broke the window, caused damage to the room and threw or broke a glass bottle filled with an unknown substance, which resembled a Molotov cocktail.
After the discovery, the superintendent dismissed students around 11 a.m.
Get Boston local news, weather forecasts, lifestyle and entertainment stories to your inbox. Sign up for NBC Boston’s newsletters.
The Wakefield Police Department is investigating the vandalism and attempted arson.
No other details were immediately available.