The suspect accused of fatally shooting a Minnesota lawmaker and her husband in a gun rampage last week was a doomsday "prepper", according to the FBI.
The wife of the accused, Vance Boelter, told investigators the family was among a small group of Americans who "prepare for major or catastrophic incidents", said a court document.
Boelter, 57, has been charged with killing Democratic House Speaker Emerita Melissa Hortman and her husband, Mark, last Saturday.
He also seriously wounded Democratic State Senator John Hoffman and his wife, Yvette. Police say there is evidence he was planning to target others.
Police captured Mr Boelter in woods last Sunday after a two-day manhunt.
