New Haven firefighters responded to Gateway Community College on Monday morning after suspicious powder was found in a package and determined the substance was harmless.
The building at 20 Church St. was partially evacuated and students outside campus told NBC Connecticut they were not allowed into the building.
According to a tweet from the school, one building was evacuated.
"GCC is open but evacuating the North Building. All the proper authorities are here. There is no threat to the public or the GCC population just precautionary measures," the tweet read.
Seven people were checked out for possible exposure to the substance as a precaution, according to the fire chief.
Firefighters determined the substance was harmless and the "all clear" was given around 1 p.m.
Authorities are still trying to determine from where the package came.
