Jakubowski, 32, was apprehended at a campsite in Vernon County, Wisconsin, shortly before 6 a.m. Friday, the sheriff's office said.
The property owner, Jeffrey Gorn, told The Associated Press he spoke to the man camping on his property for about an hour and did not realize he was Jakubowski. However, law enforcement did receive a suspicious circumstance report near St. Mary's Church, on East Wall Street in Janesville.
Investigators said they analyzed the manifesto and discovered grievances focusing on several topics but no specific threat to any group.
Officials had been concerned about the potential for a mass shooting during the time Jakubowski has been on the run. "I think he knew what he was facing", Vernon County Sheriff John Spears said at a briefing, who said the suspect had been surrounded by 100 to 125 law enforcement officers. He says the man he later learned was Jakubowski was angry with society in general, but never raised his voice. Some 150 local, state and federal police officers and personnel were searching Jakubowski, who on April 4, 2017 allegedly stole some 16 "high-end firearms" from a gun store in Janesville, Wisconsin and set fire to a vehicle nearby, according to Rock County Sheriff Robert Spoden. Gorn, a retired school counselor, says the two talked cordially for almost an hour, including about Jakubowski's anger with society.
A force of some 150 local, state and federal police had been searching for the suspect since April 4, when officials say he broke into the Armageddon Gun Shop in the city of Janesville, Wisconsin and stole more than a dozen firearms. A few hours later, Jakubowski broke into a Janesville weapons store, stole 18 guns, then set his vehicle on fire, authorities have said.
Days after the manhunt began, a separate letter mailed by someone claiming to be Jakubowski threatened unspecified violence on Sunday at churches in the Sussex area, about 25 miles northwest of Milwaukee. The sheriff's office said in a statement that he was captured without incident.
In the days before Jakubowski's gun shop heist he left a copy of with bar staff.
He sent a manifesto to the president railing against the government, police, and religion.
Meanwhile, Gov. Scott Walker has canceled his annual Easter egg hunt scheduled for Saturday while Jakubowski remains at large.