A threat put Grady High School under a soft lockdown Tuesday morning.
Atlanta Public Schools Spokesperson Kimberly Willis Green said the lockdown was initiated after a threat on social media.
The school tweeted they were "clear and safe" at noon.
This comes after the district sent home a letter to parents last week sharing information about "several reports of social media postings by a person disguised as a clown making threats to schools within the district."
In the letter, Superintendent Maria Carstarphen said they have not received credible, specific threats against APS schools but wanted to be proactive in addressing the matter.
The school system is encouraging families and students to take safety precautions that include, reporting suspicious activity to 911 or APS police at (404) 802-2000.
There have been several reports of clown sightings and threats throughout the south.
In August, an apartment complex in South Carolina sent letters to residents warning them about a clown trying to lure children into the woods.
The first week of September, neighbors in Winston-Salem said a creepy clown was offering kids candy if they followed him into the woods. Witnesses said the clown ran from the area when officers arrived.
A North Carolina man was arrested and charged with filing a false report after telling police a clown knocked on his window. He told police he tried to chase the clown, but later admitted he made it all up.
In Dublin, Georgia, someone in a car accident said they swerved to avoid a clown in the road. Dublin Police Chief Tim Chatman said there's no evidence it's true. Chatman said his department has investigated several reported sightings "and we have yet to substantiate" any of them.
In LaGrange, police arrested four people for making terroristic threats against school children. Someone allegedly started a Facebook Page threatening to dress like a clown and drive a white van to schools and abduct children.