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,

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:

The man, Jeffrey Michael Kelly, 60, was arrested Tuesday, according to the authorities. Mr. Kelly also set out anti-Democratic Party signs lined with razor blades near his home, attaching bags filled with an unknown white powder and labeled “Biohazard,” according to court papers.

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.

Police investigating a series of shootings a Democratic National Committee office in Arizona found more than 120 guns, 250,000 rounds of ammunition and a grenade launcher at the home of a suspect, according to the local attorney’s office.

Police linked the suspect with a suspicious white substance found on anti-Democratic signs after arresting likely suspect in multiple shooting attempts.

The suspect was also arrested for allegedly hanging suspicious bags of white power from political signs lined with razor blades.

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.

Authorities said they found 120 guns and 250,000 rounds of ammunition when they raided Jeffrey Kelly's Arizona home.