Police have arrested a man suspected of shooting up a Democratic Party office in Tempe on three different occasions. Here's what to know:

In less than two weeks, Arizonans and the nation will decide the next president of the United States, but concerns about political violence leading up to and after Election Day has experts concerned,

(CNN) — Arizona investigators surveilling the man accused of shooting at the Democratic National Committee office in a suburb of Phoenix saw him posting political signs with bags of a white, powdery substance attached,

Jeffrey Michael Kelly, 60, allegedly fired gunshots at the glass front door and a window of an Arizona Democrats' field office.

Authorities in Arizona say a man arrested in shootings targeting Democratic campaign offices near Phoenix had more than 120 guns and apparently had been plotting a mass casualty event.

The man arrested in connection to a shooting at the Democratic National Committee’s (DNC) field office in Tempe, Ariz., may have been planning a mass casualty event, Maricopa County prosecutor

Police found a huge stash of guns and ammunition in his home, leading prosecutors to believe he was was planning a "mass casualty" event.

An Arizona man has been arrested on terrorism charges in connection with three shootings at a Democratic Party campaign office in suburban Phoenix that wounded no one but rattled campaign workers in a bitter election season.

Authorities searching the home of a 60-year-old man accused of shooting at a Democratic National Committee office in Tempe, Arizona, discovered an extensive collection of weapons — including 120 guns,