Sheriff Reich's Weekly Update article - https://www.eatoncounty.org/departments/office-of-the-sheriff/119-departments/office-of-the-sheriff/740-weekly-update-2018a

From Eaton County Sheriff's Office Emergency Management and Homeland Security Section:

At approximately 7:13am Eaton Rapids Police Department was alerted to a potential school violence threat. The source of the report was a tech company in Finland whose system had picked up a chat message from a user in a game that stated their intent to carry out a school shooting today. The user did not identify a school or a location and did not make any other statements that we are aware of on this topic. That information was eventually turned over to the Federal Bureau of Investigation who contacted local police.
An Eaton Rapids School official, agents from the Federal Bureau Investigation and deputies from the Eaton County Sheriff’s Office assembled at Eaton Rapids Public Safety Building to assess the information and determine a course of action. As a precautionary measure to assure the safety of students, staff and the community, the school was placed in “shelter in place” mode. In this situation with no suspect identified, sheltering in place limits access to the buildings by potential offender’s intent on harming our children. It’s a crucial step to assuring students and staff are safe. By doing this it means limiting access by everyone including parents. Its important to understand that school officials and law enforcement have no way to verify who a potential offender is without more information. In many acts of school violence, the offender is known to the local district. Opening the doors to allow mass entry or exits creates too grave of security risk to the people inside.
Regarding the investigation, an internet protocol(IP) address for the user who posted the message was provided by the company. That address is considered by the internet carrier as a “roving” or “add on” address. Due to the nature of how these addresses are assigned to devices the service provided could not assure us that the user was even from the Eaton Rapids area. Although the suspect may be from here, they could be from anywhere.
The investigation remains ongoing with assistance from the Federal Bureau of Investigation and the Eaton County Sheriff’s Office. We greatly appreciate their assistance in this matter and will continue to work towards identifying the source of the threat.