A note was left, but authorities haven't released what it said.
From an article:
Davidson Middle School officials put the school on lockdown and contacted parents around 9:15 a.m. to pick up their children, saying at first that the school had a "police situation." WXYZ officials said that some children looked "visibly upset" when exiting the school.
According to WDIV, Southgate Schools Superintendent William Grusecki said the boy did leave a note.
From a related article:
Students were put in the gym and auditorium and parents were called to come pick up their students at about 9 a.m. The school also arranged for transportation for students to get home.
"I feel so horrible for the family of the child. I can't even imagine," said parent Sherri Zacharski
Grusecki said out of respect for the family, the boy's name wouldn't be released. But he said the boy was known as a good student, somewhat popular and had never gone to school officials with any problems he was experiencing.
School was canceled for the day Thursday and Friday. Counselors are being provided for the community, some coming from surrounding districts. ....
When asked about how a gun got into the school, Grusecki said there are no metal detectors in the building. He said school officials will review and look into what they can do in the future.
Director of Public Safety Thomas Coombs said investigators are still looking into who owned the gun. He couldn't answer whether any charges would be filed.
Every gun in the hands of a child must first pass through the hands of an adult.