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

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.

An Arizona prosecutor said the man arrested in the shooting of a Democratic National Committee office in suburban Phoenix had more than 120 guns and over 250,000 rounds of ammunition in his home, leading law enforcement to believe he may have been planning 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 Neha

An Arizona prosecutor says the man arrested in the three-time shooting of a Democratic campaign office had more than 120 guns and over 250,000 rounds of ammunition in his home

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,

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.