Someone posted a “vague and unspecified threat to create a mass casualty incident” in Shorewood on social media Wednesday , and the threat was reposted on Twitter, according to the Shorewood Police Department.
FBI surveillance software picked up the threat on Twitter and notified the Shorewood police. The two agencies then investigated the source of the threat, Shorewood police said in a news release.
“Due to the lack of specific information or intentions of the poster, the Shorewood Police Department decided to act with an abundance of caution,” Shorewood police said.
The department deployed officers to every school in Shorewood “to ensure that children were protected,” and also sent officers to select other sites on Wednesday, police said.
“School personnel were engaged to ensure all established normal security measures were in place and to be extra vigilant for any suspicious behavior,” police said.
“The Shorewood Police are investigating this along with the FBI to determine the identity and location of the individual involved if possible and ensure they have no capability to cause harm,” police said.
Anyone with information on the incident was asked to call the Shorewood Police Department at 815-725-1460.
About 9:30 a.m. Wednesday, officials with Troy School District 30-C said on Facebook that all of district schools were on alert after Shorewood police received a “general threat of violence.”
School officials said indoor recess would be held at elementary schools due to the threat.
“Both Shorewood and Joliet police departments are aware of the threat. Student safety is our number one priority,” school officials said.
School officials said when they received the alert from police, students were already at or on their way to school.
“We immediately reached out to all building leaders and enacted our response plan,” school officials said.
Troy school officials said they could not “confirm that this threat is credible” and apparently did not specify a school or venue.