An Arizona prosecutor said the man arrested in the three-time 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,

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

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