Students at Pleasant Prairie Elementary School will head back to class on Tuesday.
The school was evacuated Monday morning after an automated bomb threat was called into the schools attendance office Monday morning.
The same threat actually happened at several schools all over the country Monday, including three others in the state (Port Washington, Appleton and Green Bay) and in four other states (Colorado, Delaware, Minnesota, New Hampshire).
Authorities say this could be an example of what's called "swatting" against schools, which is fake threats that are intended to trigger massive police response.
In recent months, hoaxers playing online games have allegedly used proxy servers and other high-tech identity-disguising tools to anonymously threaten schools online or in phone messages with electronic voices to trigger a huge police response, including SWAT teams.
One nationally security expert said swatting tends to come in waves and that swatting incidents have "skyrocketed" nationwide in the past two years.