UPDATE: Joseph Jakubowski has been captured in western Wisconsin.

The manhunt for fugitive Joseph Jakubowski moved into Waukesha County on Thursday, April 13, when a letter purporting to be from Jakubowski threatened violence against Sussex churches on Easter Sunday.

The Waukesha County Sheriff's Department is investigating the threat, which came through the U.S. Postal Service, according to a news release from the sheriff's department.

Jakubowski was being sought on a number of charges and threats of violence in Rock County. He was captured in western Wisconsin in the early-morning hours of Friday, April 14.

The written threat targeted unspecified churches in the Sussex area, threatening violence on Easter Sunday.

The sheriff's department has been unable so far to substantiate the threat or its author, the news release said.

Jakubowski was being sought in a joint local, state, and federal task force seeking his apprehension on a number of charges and threats of violence in the Rock County area.

The Waukesha County Sheriff’s Department added additional resources to this investigation and worked closely with churches in the Sussex area to review safety plans for Easter Sunday.

Jakubowski, 32, is suspected of stealing guns from a Janesville gun shop two weeks and was on the run until he was captured after 10 days. He also allegedly made threats against elected officials and schools, and reportedly sent a rambling manifesto to President Donald Trump critical of government and religion.

A suspect thought to be Jakubowski is alleged to have made suspicious inquiries at a Sun Prairie church last week.

Janesville and other Rock County schools were on lockdown Thursday, April 6, as a safety precaution. Some Waukesha County Schools — St. Anthony on the Lake and Pewaukee Public Schools — followed suit on Friday, April 7.

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