MILWAUKEE -- Sheriff's officials say a man suspected of stealing firearms from a gun store and sending President Donald Trump an anti-government manifesto has been arrested in southwestern Wisconsin.

The Rock County Sheriff's Office says 32-year-old Joseph Jakubowski was captured around 6 a.m. Friday near Readstown, Wisconsin. The sheriff's office said in a statement that he was captured without incident.

Readstown is 160 miles west of Milwaukee.

More than 150 law enforcement officials had been searching for Jakubowski since April 4 when authorities say he broke into a gun store in Janesville, about 70 miles southwest of Milwaukee.

The Rock County Sheriff's Office says Jakubowski wrote a 161-page manifesto in which he detailed a long list of grievances against the government and spoke of plans to launch attacks with the 18 firearms he allegedly stole.

Earlier in the morning, it was reported a letter from someone purporting to be Jakubowski threatened violence Easter Sunday against churches about 19 miles northwest of Milwaukee.

The threat of unspecified violence against unspecified churches in Sussex, Wis., was sent through the U.S. Postal Service, but authorities have not been able to substantiate the threat nor its author, according to a news release from the Sheriff's Office.

Investigators have said Joseph Jakubowski mailed a 161-page manifesto to President 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.

A nationwide search was launched April 4 for Jakubowski, 32, who is suspected of stealing firearms from a Janesville, Wis., gun shop, including an automatic weapon, and threatening to use them on public officials or a school, according to the Rock County (Wis.) Sheriff's Office.

Related: Man accused of stealing guns, sending 161-page manifesto to Trump; intense manhunt continues

Janesville Police Chief David Moore and Rock County Sheriff Robert Spoden said authorities have received more than 700 tips in the nationwide search for Jakubowski, who has been at-large for a week. The tips have largely come from local and state residents, with a few originating as far away as Texas and Oklahoma, they said.

Spoden said investigators can’t rule out Jakubowski is being aided by accomplices, but “right now we just don’t have the information or evidence that anybody is assisting him.”