Maybe as many as 7 altogether in Princeton,MN:
"PRINCETON, Minn. — An eastern Minnesota school superintendent says a suspicious package found outside his town's high school on Wednesday contained an incendiary device.
Princeton schools Superintendent Rick Lahn (LAYN) says he learned that in a meeting with Police Chief Brian Payne. Lahn says the chief couldn't give him details but told him it was "very suspicious and it contained some explosive material."
Lahn says he doesn't think it was a large device but doesn't know what kind of damage it could have done.
The package discovered by a custodian outside the high school was one of three found in Princeton on Wednesday morning.
A clerk found a similar package in front of the post office and another in front of Princeton High School forcing the evacuation of more than 3,000 students in the school district. There were three small packages.....Sources tell KARE 11 that in addition to the initial three, four more devices may have been located in Princeton. They were described as homemade devices, possibly even working devices."
Kids attempting to get classes cancelled wouldn't have also placed a device at the post office.
It sounds like someone wanted to completely shut down the town and then study the response......a dry run perhaps.
The FBI and the ATF have been called in.