Janesville close 21 schools Friday in response to threats Jakubowski allegedly made.
The School District of Milton in Rock County said if there is no change Thursday night into Friday, schools will be closed Friday. Police said they believe that Jakubowski also had a bulletproof vest and helmet.
On the same day of the break-in, a vehicle fire was reported on Pennycook Lane, a short distance away from the gun shop.
On Thursday, someone reported seeing a man with a rifle outside a Janesville elementary school. That means classes are held but doors to classrooms and the schools are locked.
The Rock County Sheriff's Office says they will continue following leads until Jakubowski is caught.
According to the Rock County Sheriff's Office, additional resources have come in from Chicago and Minneapolis/St. Paul to help local, state and federal agencies here in Janesville. "There are no viable threats to specific students or staff within the school district".
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He has pleaded guilty to insider trading charges and is likely to receive leniency at sentencing as a result of his testimony. Las Vegas sports gambler Billy Walters was found guilty Friday in a trial related to an insider trading scheme.
Police said Jakubowski should be considered a national threat.
Officials say they have also found a 161 page anti-government manifesto that Jakubowski sent to President Trump.
The 33-year-old Janesville man is described as Caucasian, 5-foot-10, with green eyes and brown hair. When officials spoke to an associate of Jakubowski, they learned Jakubowski made a statement about stealing guns and about an unspecified attack. Their tip line is 1-800-225-5324.
"You seen the name, you've seen the address, all the stamps".
The Federal Bureau of Investigation, the Federal Bureau of Alcohol, Tobacco, and Firearms, the Wisconsin Division of Criminal Investigation and local law enforcement agencies are assisting in the search for Jakubowski.
A massive manhunt continues in Wisconsin as police have released a new surveillance image of a man described as "armed and risky".