Chaska police have arrested a male juvenile in connection with threats that led to a lockdown and early dismissal at the high school on Tuesday, Twin Cities media reported.
Police said the juvenile, who was in custody Wednesday night, acted alone, the Star Tribune reported.
Officials canceled classes for its more than 1,200 students about mid-morning Tuesday, and a normal schedule resumed Wednesday.
District officials had diverted buses and locked the school down earlier in the morning after receiving a threat. Police conducted a search of the school and grounds. Even cars were searched, Fox 9 reported. But the search turned up nothing.
The type of threat has not been disclosed.