Shaker Heights High School was placed on precautionary lockdown Monday morning, the district announced on its website.
The school went on lockdown around 10:45 a.m. as a result of a "possible threat."
Police searched the building after three bomb threats were received. Nothing as found inside the school. School officials say the threats may be linked to a social media incident involving several students that occurred last week. Police will determine if there are any connections.
The school was on lockdown for about 90 minutes before classes were dismissed for the day.
"We take these things very seriously," Superintendent Dr. Gregory Hutchings, Jr. said in a statement. "We are fully cooperating with the police. We are saddened that people have taken it upon themselves to disrupt our educational process. We will get through this together."
Stay with WKYC.com as updates become available.