Officers discovered notebooks in the vehicle of Vance Boelter, the suspect in Minnesota, revealing detailed plans for his attack on two Democratic lawmakers and their spouses. Photos display lists of websites used to locate official residences, noting whether the services were free or paid.

The notes primarily contained home addresses of the targeted officials, according to the US Attorney’s Office for the District of Minnesota.

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Additional images inside Boelter’s vehicle depict a cache of assault rifles and ammunition.

Vance Boelter, 57, from Green Isle, Minnesota, faces charges of stalking and killing Rep. Melissa Hortman and her husband. He is also accused of stalking and shooting State Senator John Hoffman and his wife, as announced by Acting US Attorney Joseph H. Thompson.

He was apprehended Sunday night in a field near his residence, after Minnesota’s largest manhunt ever.