Police responded to Hartford Magnet Trinity College Academy on Vernon Street Wednesday after a bomb threat was found written on a bathroom wall at the school.
The threat said "I'm going to blow up this school," according to superintendent Dr. Leslie Torres-Rodriguez.
Students had already been dismissed for a half-day when the message was discovered. School staff were still there and the building was evacuated, Torres-Rodriguez said.
The building was given the all clear around 2 p.m.