More than 80 percent of the Lake Mary High School student body was absent after note scrawled on a girls bathroom wall 12 days ago threatened violence Tuesday.

About 472 of 2,922 students — or 16 percent — of students attended classes Tuesday, Seminole County Public Schools said.

Administrators at Lake Mary High only informed parents on Monday in an email and phone call.

The threat was in the form of graffiti on a girls' bathroom stall that listed Feb. 20 as a target date for violence on campus.

In a recorded message to parents, Principal Mickey Reynolds said the school investigated the threat but could not find the source of it and concluded it was not credible.

Then, after the South Florida school shooting by Nikolas Cruz that left 17 dead, Reynolds says students made several social media posts about the Lake Mary High threat.

Parent Shonte Elias said she wouldn't let her children go to school Tuesday.

"We are sending them to learn so they can have a brighter future and a lot of kids get that taken away from them in these school shootings," she said. "It's something that I'm taking seriously whether it’s credible or not."

A Lake Mary High School student said he felt the threat was "concerning."

"I believe it's concerning, because obviously we wouldn't take it like as a big thing, but with the recent events playing out, just one in the country and obviously in Florida, it's a little more concerning seeing there may be a little more validity than what there usually would be," Matthew Hochfelder said.

Reynolds said she has ordered electronic locks for school doors and will be limiting access in and out of the school until those can be installed.

Reynolds is also planning a town hall to address school safety.

The threat comes a year after a very similar warning was made in a boys bathroom stall at Lake Mary High. Spectrum News 13 reached out to the school district to see if the two incidents are related.