Manhunt subject Joseph Jakubowski was taken into custody early Friday in Vernon County, according to the Rock County Sheriff's Office.
Jakubowski was arrested just before 6 a.m. Friday after he was found camping on a farmer's property near Readstown. The farmer filed a suspicious complaint saying a man "matching the description of Jakubowski was camping at that location and refused to leave when he had been asked to do so," the sheriff's department said in a news release.
"Investigators assigned to the Jakubowski case were sent to that location along with tactical support to assist local authorities in determining whether the suspicious individual was related to the manhunt," the release said.
Tactical officers made contact with the man at the campsite, and he was "taken into custody without incident and positively identified as Joseph A. Jakubowski, our wanted fugitive."
The department said it was making arrangements for Jakubowski to be returned to Rock County for further investigation and charges.
A nationwide search was launched last week for Jakubowski, 32, who is suspected of stealing firearms from a Janesville gun shop, including an automatic weapon, and threatening to use them on public officials or a school.
The FBI offered a $20,000 reward for information leading to Jakubowski's location.
Investigators have said Jakubowski mailed a 161-page manifesto to President Donald Trump that contains extensive, rambling screeds against the government and religion. While there are no specific targets listed, he does suggest he’s willing to carry out violent acts. Officials have said Jakubowski doesn’t affiliate himself with any particular political party in the manifesto.
An unnamed associate recorded Jakubowski mailing the manifesto on the afternoon of April 4. A few hours later, Jakubowski broke into a Janesville weapons store, stole 18 guns, then set his car on fire, authorities have said.
A portion of the document was published Thursday by WTMJ-TV, which said it received a copy from a source who had the manifesto before Jakubowski’s disappearance. In it, Jakubowski said the government and religion are brainwashing citizens, and he wants his death “carried out by the hands of the president” on live television, the station reported.
Authorities said they don’t know who mailed the portion, which contains 36 of the 161 pages. Investigators have obtained two copies of the manifesto: the original mailed to Trump; and a version provided by a cooperating source.